| twofeat

## Function

Finds neighbouring pairs of features in sequences

## Description

twofeat reads in the feature tables of sequences and reports occurances of pairs of specified features.

This is intended for use as a simple data-mining tool to enable you to look for instances of pairs of features that occur near to each other in the same sequence entry.

For each of the pair of features, you can specify its type name, its sense, its score and any tag/value pairs, amongst other things.

You can then specify the type of relationship that the two features should have. You can specify the minimum and maximum distance between them. You can specify the type of overlap allowed: Any type of overlap or no overlap is allowed, Overlap required, No overlaps are allowed, Overlap required but one feature must not be completely within the other, Feature A must be completely enclosed within feature B, Feature B must be completely enclosed within feature A. You can specify that the distance should be measured from the nearest ends of the two features, From the left ends, From right ends, From the furthest ends. You can specify that the features should be in any sense, in the same sense or in opposite senses. You can specify that the features should be in any order, Feature A then feature B, Feature B then feature A.

By default the resulting pairs of features found are then written to a report file as a single feature from the first postion of the left-most feature to the last position of the right-most feature. You can modify the output to report the pairs of features with no changes made to them.

## Algorithm

    For each sequence:
    	identify the features that match the criteria for Feature A
    	identify the features that match the criteria for Feature B
    	compare all pairs of features
    	if they satisfy the requirements output them to the report file

## Usage

Here is a sample session with twofeat

Without the -twoout option the output report contains just one feature for every pair of features found.

    % twofeat tembl:hsfau
    Finds neighbouring pairs of features in sequences
    Type of first feature [*]: polyA_signal
    Type of second feature [*]: polyA_site
    The minimum distance between the features [0]: 10
    The maximum distance between the features [0]: 50
    Output report [hsfau.twofeat]:

Go to the input files for this example
Go to the output files for this example

Example 2

The -twoout option makes the output report give the pairs of features found. The ouput report format type has been changed to display the full original pairs of faetures in GFF format.

    % twofeat -twoout -rformat gff tembl:hsfau
    Finds neighbouring pairs of features in sequences
    Type of first feature [*]: polyA_signal
    Type of second feature [*]: polyA_site
    The minimum distance between the features [0]: 10
    The maximum distance between the features [0]: 50
    Output report [hsfau.twofeat]:

Go to the output files for this example

## Command line arguments

       Mandatory qualifiers:
      [-sequence]          seqall     Sequence database USA
       -atype              string     By default every feature in the feature
                                      table is allowed. You can set this to be any
                                      feature type you wish to allow.
                                      See http://www3.ebi.ac.uk/Services/WebFeat/
                                      for a list of the EMBL feature types and see
                                      Appendix A of the Swissprot user manual in
                                      http://www.expasy.ch/txt/userman.txt for a
                                      list of the Swissprot feature types.
                                      The type may be wildcarded by using '*'.
                                      If you wish to allow more than one type,
                                      separate their names with the character '|',
                                      eg:
                                      *UTR | intron
       -btype              string     By default every feature in the feature
                                      table is allowed. You can set this to be any
                                      feature type you wish to allow.
                                      See http://www3.ebi.ac.uk/Services/WebFeat/
                                      for a list of the EMBL feature types and see
                                      Appendix A of the Swissprot user manual in
                                      http://www.expasy.ch/txt/userman.txt for a
                                      list of the Swissprot feature types.
                                      The type may be wildcarded by using '*'.
                                      If you wish to allow more than one type,
                                      separate their names with the character '|',
                                      eg:
                                      *UTR | intron
       -minrange           integer    If this is greater or equal to 'maxrange',
                                      then no min or max range is specified
       -maxrange           integer    If this is less than or equal to 'minrange',
                                      then no min or max range is specified
      [-outfile]           report     File for output of neighbouring feature
                                      regions. This contains details of the pairs
                                      of features. By default, it is written in
                                      TABLE format.

       Optional qualifiers (* if not always prompted):
       -asource            string     By default any feature source in the feature
                                      table is allowed. You can set this to match
                                      any feature source you wish to allow.
                                      The source name is usually either the name
                                      of the program that detected the feature or
                                      it is the feature table (eg: EMBL) that the
                                      feature came from.
                                      The source may be wildcarded by using '*'.
                                      If you wish to allow more than one source,
                                      separate their names with the character '|',
                                      eg:
                                      gene* | embl
       -asense             menu       By default any feature sense is allowed. You
                                      can set this to match the required sense.
       -aminscore          float      If this is greater than or equal to the
                                      maximum score, then any score is allowed.
       -amaxscore          float      If this is less than or equal to the maximum
                                      score, then any score is permitted.
       -atag               string     Tags are the types of extra values that a
                                      feature may have. For example in the EMBL
                                      feature table, a 'CDS' type of feature may
                                      have the tags '/codon', '/codon_start',
                                      '/db_xref', '/EC_number', '/evidence',
                                      '/exception', '/function', '/gene',
                                      '/label', '/map', '/note', '/number',
                                      '/partial', '/product', '/protein_id',
                                      '/pseudo', '/standard_name', '/translation',
                                      '/transl_except', '/transl_table', or
                                      '/usedin'. Some of these tags also have
                                      values, for example '/gene' can have the
                                      value of the gene name.
                                      By default any feature tag in the feature
                                      table is allowed. You can set this to match
                                      any feature tag you wish to allow.
                                      The tag may be wildcarded by using '*'.
                                      If you wish to allow more than one tag,
                                      separate their names with the character '|',
                                      eg:
                                      gene | label
       -avalue             string     Tag values are the values associated with a
                                      feature tag. Tags are the types of extra
                                      values that a feature may have. For example
                                      in the EMBL feature table, a 'CDS' type of
                                      feature may have the tags '/codon',
                                      '/codon_start', '/db_xref', '/EC_number',
                                      '/evidence', '/exception', '/function',
                                      '/gene', '/label', '/map', '/note',
                                      '/number', '/partial', '/product',
                                      '/protein_id', '/pseudo', '/standard_name',
                                      '/translation', '/transl_except',
                                      '/transl_table', or '/usedin'. Only some of
                                      these tags can have values, for example
                                      '/gene' can have the value of the gene name.
                                      By default any feature tag value in the
                                      feature table is allowed. You can set this
                                      to match any feature tag value you wish to
                                      allow.
                                      The tag value may be wildcarded by using
                                      '*'.
                                      If you wish to allow more than one tag
                                      value, separate their names with the
                                      character '|', eg:
                                      pax* | 10
       -bsource            string     By default any feature source in the feature
                                      table is allowed. You can set this to match
                                      any feature source you wish to allow.
                                      The source name is usually either the name
                                      of the program that detected the feature or
                                      it is the feature table (eg: EMBL) that the
                                      feature came from.
                                      The source may be wildcarded by using '*'.
                                      If you wish to allow more than one source,
                                      separate their names with the character '|',
                                      eg:
                                      gene* | embl
       -bsense             menu       By default any feature sense is allowed. You
                                      can set this to match the required sense.
       -bminscore          float      If this is greater than or equal to the
                                      maximum score, then any score is allowed.
       -bmaxscore          float      If this is less than or equal to the maximum
                                      score, then any score is permitted.
       -btag               string     Tags are the types of extra values that a
                                      feature may have. For example in the EMBL
                                      feature table, a 'CDS' type of feature may
                                      have the tags '/codon', '/codon_start',
                                      '/db_xref', '/EC_number', '/evidence',
                                      '/exception', '/function', '/gene',
                                      '/label', '/map', '/note', '/number',
                                      '/partial', '/product', '/protein_id',
                                      '/pseudo', '/standard_name', '/translation',
                                      '/transl_except', '/transl_table', or
                                      '/usedin'. Some of these tags also have
                                      values, for example '/gene' can have the
                                      value of the gene name.
                                      By default any feature tag in the feature
                                      table is allowed. You can set this to match
                                      any feature tag you wish to allow.
                                      The tag may be wildcarded by using '*'.
                                      If you wish to allow more than one tag,
                                      separate their names with the character '|',
                                      eg:
                                      gene | label
       -bvalue             string     Tag values are the values associated with a
                                      feature tag. Tags are the types of extra
                                      values that a feature may have. For example
                                      in the EMBL feature table, a 'CDS' type of
                                      feature may have the tags '/codon',
                                      '/codon_start', '/db_xref', '/EC_number',
                                      '/evidence', '/exception', '/function',
                                      '/gene', '/label', '/map', '/note',
                                      '/number', '/partial', '/product',
                                      '/protein_id', '/pseudo', '/standard_name',
                                      '/translation', '/transl_except',
                                      '/transl_table', or '/usedin'. Only some of
                                      these tags can have values, for example
                                      '/gene' can have the value of the gene name.
                                      By default any feature tag value in the
                                      feature table is allowed. You can set this
                                      to match any feature tag value you wish to
                                      allow.
                                      The tag value may be wildcarded by using
                                      '*'.
                                      If you wish to allow more than one tag
                                      value, separate their names with the
                                      character '|', eg:
                                      pax* | 10
       -overlap            menu       This allows you to specify the allowed
                                      overlaps of the features A and B.
                                      You can allow any or no overlaps, specify
                                      that they must or must not overlap, that one
                                      must or must not be wholly enclosed within
                                      another feature.
       -rangetype          menu       This allows you to specify the positions
                                      from which the allowed minimum or maximum
                                      distance between the features is measured
       -sense              menu       This allows you to specify the required
                                      sense that the two features must be on. This
                                      is ignored (always 'Any') when looking at
                                      protein sequence features.
       -order              menu       This allows you to specify the required
                                      order of the two features. The order is
                                      measured from the start positions of the
                                      features. This criterion is always applied
                                      despite the specified overlap type required.
       -twoout             boolean    If you set this to be true, then the two
                                      features themselves will be written out. If
                                      it is left as false, then a single feature
                                      will be written out covering the two
                                      features you found.
    *  -typeout            string     If you have specified that the pairs of
                                      features that are found should be reported
                                      as one feature in the ouput, then you can
                                      specify the 'type' name of the new feature
                                      here. By default every feature in the
                                      feature table is allowed. See
                                      http://www3.ebi.ac.uk/Services/WebFeat/ for
                                      a list of the EMBL feature types and see
                                      Appendix A of the Swissprot user manual in
                                      http://www.expasy.ch/txt/userman.txt for a
                                      list of the Swissprot feature types. If you
                                      specify an invalid feature type name, then
                                      the default name 'misc_feature' is used.

       Advanced qualifiers: (none)
       Associated qualifiers:
      "-sequence" related qualifiers
       -sbegin1             integer    First base used
       -send1               integer    Last base used, def=seq length
       -sreverse1           boolean    Reverse (if DNA)
       -sask1               boolean    Ask for begin/end/reverse
       -snucleotide1        boolean    Sequence is nucleotide
       -sprotein1           boolean    Sequence is protein
       -slower1             boolean    Make lower case
       -supper1             boolean    Make upper case
       -sformat1            string     Input sequence format
       -sopenfile1          string     Input filename
       -sdbname1            string     Database name
       -sid1                string     Entryname
       -ufo1                string     UFO features
       -fformat1            string     Features format
       -fopenfile1          string     Features file name
      "-outfile" related qualifiers
       -rformat2            string     Report format
       -rname2              string     Base file name
       -rextension2         string     File name extension
       -rdirectory2         string     Output directory
       -raccshow2           boolean    Show accession number in the report
       -rdesshow2           boolean    Show description in the report
       -rscoreshow2         boolean    Show the score in the report
       -rusashow2           boolean    Show the full USA in the report

       General qualifiers:
       -auto                boolean    Turn off prompts
       -stdout              boolean    Write standard output
       -filter              boolean    Read standard input, write standard output
       -options             boolean    Prompt for required and optional values
       -debug               boolean    Write debug output to program.dbg
       -acdlog              boolean    Write ACD processing log to program.acdlog
       -acdpretty           boolean    Rewrite ACD file as program.acdpretty
       -acdtable            boolean    Write HTML table of options
       -verbose             boolean    Report some/full command line options
       -help                boolean    Report command line options. More
                                      information on associated and general
                                      qualifiers can be found with -help -verbose
       -warning             boolean    Report warnings
       -error               boolean    Report errors
       -fatal               boolean    Report fatal errors
       -die                 boolean    Report deaths

Mandatory qualifiers | Allowed values | Default
--- | --- | ---
[-sequence] (Parameter 1) | Sequence database USA | Readable sequence(s) | Required
-atype | By default every feature in the feature table is allowed. You can set this to be any feature type you wish to allow. See http://www3.ebi.ac.uk/Services/WebFeat/ for a list of the EMBL feature types and see Appendix A of the Swissprot user manual in http://www.expasy.ch/txt/userman.txt for a list of the Swissprot feature types. The type may be wildcarded by using '*'. If you wish to allow more than one type, separate their names with the character '|', eg: *UTR | intron | Any string is accepted | *
-btype | By default every feature in the feature table is allowed. You can set this to be any feature type you wish to allow. See http://www3.ebi.ac.uk/Services/WebFeat/ for a list of the EMBL feature types and see Appendix A of the Swissprot user manual in http://www.expasy.ch/txt/userman.txt for a list of the Swissprot feature types. The type may be wildcarded by using '*'. If you wish to allow more than one type, separate their names with the character '|', eg: *UTR | intron | Any string is accepted | *
-minrange | If this is greater or equal to 'maxrange', then no min or max range is specified | Any integer value | 0
-maxrange | If this is less than or equal to 'minrange', then no min or max range is specified | Any integer value | 0
[-outfile] (Parameter 2) | File for output of neighbouring feature regions. This contains details of the pairs of features. By default, it is written in TABLE format. | Report output file |
Optional qualifiers | Allowed values | Default
-asource | By default any feature source in the feature table is allowed. You can set this to match any feature source you wish to allow. The source name is usually either the name of the program that detected the feature or it is the feature table (eg: EMBL) that the feature came from. The source may be wildcarded by using '*'. If you wish to allow more than one source, separate their names with the character '|', eg: gene* | embl | Any string is accepted | *
-asense | By default any feature sense is allowed. You can set this to match the required sense. |
0 | (Any sense)
+ | (Forward sense)
- | (Reverse sense)
| 0
-aminscore | If this is greater than or equal to the maximum score, then any score is allowed. | Any numeric value | 0.0
-amaxscore | If this is less than or equal to the maximum score, then any score is permitted. | Any numeric value | 0.0
-atag | Tags are the types of extra values that a feature may have. For example in the EMBL feature table, a 'CDS' type of feature may have the tags '/codon', '/codon_start', '/db_xref', '/EC_number', '/evidence', '/exception', '/function', '/gene', '/label', '/map', '/note', '/number', '/partial', '/product', '/protein_id', '/pseudo', '/standard_name', '/translation', '/transl_except', '/transl_table', or '/usedin'. Some of these tags also have values, for example '/gene' can have the value of the gene name. By default any feature tag in the feature table is allowed. You can set this to match any feature tag you wish to allow. The tag may be wildcarded by using '*'. If you wish to allow more than one tag, separate their names with the character '|', eg: gene | label | Any string is accepted | *
-avalue | Tag values are the values associated with a feature tag. Tags are the types of extra values that a feature may have. For example in the EMBL feature table, a 'CDS' type of feature may have the tags '/codon', '/codon_start', '/db_xref', '/EC_number', '/evidence', '/exception', '/function', '/gene', '/label', '/map', '/note', '/number', '/partial', '/product', '/protein_id', '/pseudo', '/standard_name', '/translation', '/transl_except', '/transl_table', or '/usedin'. Only some of these tags can have values, for example '/gene' can have the value of the gene name. By default any feature tag value in the feature table is allowed. You can set this to match any feature tag value you wish to allow. The tag value may be wildcarded by using '*'. If you wish to allow more than one tag value, separate their names with the character '|', eg: pax* | 10 | Any string is accepted | *
-bsource | By default any feature source in the feature table is allowed. You can set this to match any feature source you wish to allow. The source name is usually either the name of the program that detected the feature or it is the feature table (eg: EMBL) that the feature came from. The source may be wildcarded by using '*'. If you wish to allow more than one source, separate their names with the character '|', eg: gene* | embl | Any string is accepted | *
-bsense | By default any feature sense is allowed. You can set this to match the required sense. |
0 | (Any sense)
+ | (Forward sense)
- | (Reverse sense)
| 0
-bminscore | If this is greater than or equal to the maximum score, then any score is allowed. | Any numeric value | 0.0
-bmaxscore | If this is less than or equal to the maximum score, then any score is permitted. | Any numeric value | 0.0
-btag | Tags are the types of extra values that a feature may have. For example in the EMBL feature table, a 'CDS' type of feature may have the tags '/codon', '/codon_start', '/db_xref', '/EC_number', '/evidence', '/exception', '/function', '/gene', '/label', '/map', '/note', '/number', '/partial', '/product', '/protein_id', '/pseudo', '/standard_name', '/translation', '/transl_except', '/transl_table', or '/usedin'. Some of these tags also have values, for example '/gene' can have the value of the gene name. By default any feature tag in the feature table is allowed. You can set this to match any feature tag you wish to allow. The tag may be wildcarded by using '*'. If you wish to allow more than one tag, separate their names with the character '|', eg: gene | label | Any string is accepted | *
-bvalue | Tag values are the values associated with a feature tag. Tags are the types of extra values that a feature may have. For example in the EMBL feature table, a 'CDS' type of feature may have the tags '/codon', '/codon_start', '/db_xref', '/EC_number', '/evidence', '/exception', '/function', '/gene', '/label', '/map', '/note', '/number', '/partial', '/product', '/protein_id', '/pseudo', '/standard_name', '/translation', '/transl_except', '/transl_table', or '/usedin'. Only some of these tags can have values, for example '/gene' can have the value of the gene name. By default any feature tag value in the feature table is allowed. You can set this to match any feature tag value you wish to allow. The tag value may be wildcarded by using '*'. If you wish to allow more than one tag value, separate their names with the character '|', eg: pax* | 10 | Any string is accepted | *
-overlap | This allows you to specify the allowed overlaps of the features A and B. You can allow any or no overlaps, specify that they must or must not overlap, that one must or must not be wholly enclosed within another feature. |
A | (Any)
O | (Overlap required)
NO | (No overlaps are allowed)
NW | (Overlap required but not within)
AW | (A must be all within B)
BW | (B must be all within A)
| A
-rangetype | This allows you to specify the positions from which the allowed minimum or maximum distance between the features is measured |
N | (From nearest ends)
L | (From left ends)
R | (From right ends)
F | (From furthest ends)
| N
-sense | This allows you to specify the required sense that the two features must be on. This is ignored (always 'Any') when looking at protein sequence features. |
A | (Any sense)
S | (Same sense)
O | (Opposite sense)
| A
-order | This allows you to specify the required order of the two features. The order is measured from the start positions of the features. This criterion is always applied despite the specified overlap type required. |
A | (Any)
AB | (Feature A then feature B)
BA | (Feature B then feature A)
| A
-twoout | If you set this to be true, then the two features themselves will be written out. If it is left as false, then a single feature will be written out covering the two features you found. | Boolean value Yes/No | No
-typeout | If you have specified that the pairs of features that are found should be reported as one feature in the ouput, then you can specify the 'type' name of the new feature here. By default every feature in the feature table is allowed. See http://www3.ebi.ac.uk/Services/WebFeat/ for a list of the EMBL feature types and see Appendix A of the Swissprot user manual in http://www.expasy.ch/txt/userman.txt for a list of the Swissprot feature types. If you specify an invalid feature type name, then the default name 'misc_feature' is used. | Any string is accepted | misc_feature
Advanced qualifiers | Allowed values | Default
(none)

## Input file format

twofeat reads any normal sequence USAs.

### Input files for usage example

'tembl:hsfau' is a sequence entry in the example nucleic acid database 'tembl'

### Database entry: tembl:hsfau

    ID   HSFAU      standard; RNA; HUM; 518 BP.
    XX
    AC   X65923;
    XX
    SV   X65923.1
    XX
    DT   13-MAY-1992 (Rel. 31, Created)
    DT   23-SEP-1993 (Rel. 37, Last updated, Version 10)
    XX
    DE   H.sapiens fau mRNA
    XX
    KW   fau gene.
    XX
    OS   Homo sapiens (human)
    OC   Eukaryota; Metazoa; Chordata; Craniata; Vertebrata; Euteleostomi; Mammalia;
    OC   Eutheria; Primates; Catarrhini; Hominidae; Homo.
    XX
    RN   [1]
    RP   1-518
    RA   Michiels L.M.R.;
    RT   ;
    RL   Submitted (29-APR-1992) to the EMBL/GenBank/DDBJ databases.
    RL   L.M.R. Michiels, University of Antwerp, Dept of Biochemistry,
    RL   Universiteisplein 1, 2610 Wilrijk, BELGIUM
    XX
    RN   [2]
    RP   1-518
    RX   MEDLINE; 93368957.
    RA   Michiels L., Van der Rauwelaert E., Van Hasselt F., Kas K., Merregaert J.;
    RT   " fau cDNA encodes a ubiquitin-like-S30 fusion protein and is expressed as
    RT   an antisense sequences in the Finkel-Biskis-Reilly murine sarcoma virus";
    RL   Oncogene 8:2537-2546(1993).
    XX
    DR   SWISS-PROT; P35544; UBIM_HUMAN.
    DR   SWISS-PROT; Q05472; RS30_HUMAN.
    XX
    FH   Key             Location/Qualifiers
    FH
    FT   source          1..518
    FT                   /chromosome="11q"
    FT                   /db_xref="taxon:9606"
    FT                   /organism="Homo sapiens"
    FT                   /tissue_type="placenta"
    FT                   /clone_lib="cDNA"
    FT                   /clone="pUIA 631"
    FT                   /map="13"
    FT   misc_feature    57..278
    FT                   /note="ubiquitin like part"
    FT   CDS             57..458
    FT                   /db_xref="SWISS-PROT:P35544"
    FT                   /db_xref="SWISS-PROT:Q05472"
    FT                   /gene="fau"
    FT                   /protein_id="CAA46716.1"
    FT                   /translation="MQLFVRAQELHTFEVTGQETVAQIKAHVASLEGIAPEDQVVLLAG
    FT                   APLEDEATLGQCGVEALTTLEVAGRMLGGKVHGSLARAGKVRGQTPKVAKQEKKKKKTG
    FT                   RAKRRMQYNRRFVNVVPTFGKKKGPNANS"
    FT   misc_feature    98..102
    FT                   /note="nucleolar localization signal"
    FT   misc_feature    279..458
    FT                   /note="S30 part"
    FT   polyA_signal    484..489
    FT   polyA_site      509
    XX
    SQ   Sequence 518 BP; 125 A; 139 C; 148 G; 106 T; 0 other;
         ttcctctttc tcgactccat cttcgcggta gctgggaccg ccgttcagtc gccaatatgc        60
         agctctttgt ccgcgcccag gagctacaca ccttcgaggt gaccggccag gaaacggtcg       120
         cccagatcaa ggctcatgta gcctcactgg agggcattgc cccggaagat caagtcgtgc       180
         tcctggcagg cgcgcccctg gaggatgagg ccactctggg ccagtgcggg gtggaggccc       240
         tgactaccct ggaagtagca ggccgcatgc ttggaggtaa agttcatggt tccctggccc       300
         gtgctggaaa agtgagaggt cagactccta aggtggccaa acaggagaag aagaagaaga       360
         agacaggtcg ggctaagcgg cggatgcagt acaaccggcg ctttgtcaac gttgtgccca       420
         cctttggcaa gaagaagggc cccaatgcca actcttaagt cttttgtaat tctggctttc       480
         tctaataaaa aagccactta gttcagtcaa aaaaaaaa                               518
    //

## Output file format

The output is a standard EMBOSS report file.

The results can be output in one of several styles by using the command-line qualifier -rformat xxx, where 'xxx' is replaced by the name of the required format. The available format names are: embl, genbank, gff, pir, swiss, trace, listfile, dbmotif, diffseq, excel, feattable, motif, regions, seqtable, simple, srs, table, tagseq

See: http://www.uk.embnet.org/Software/EMBOSS/Themes/ReportFormats.html for further information on report formats.

twofeat outputs a report format file. The default format is table

### Output files for usage example

### File: hsfau.twofeat

    ########################################
    # Program: twofeat
    # Rundate: Thu May 22 10:59:08 2003
    # Report_format: table
    # Report_file: hsfau.twofeat
    ########################################

    #=======================================
    #
    # Sequence: HSFAU     from: 1   to: 518
    # HitCount: 1
    #=======================================

      Start     End   Score starta   enda startb   endb
        484     509   0.000    484    489    509    509

    #---------------------------------------
    #---------------------------------------

### Output files for usage example 2

### File: hsfau.twofeat

## Data files

None.

## Notes

It can't find features that are not in the input sequences. It has no way of checking whether the input features are correct or not. Remember this when you are searching public databases.

## References

None.

## Warnings

None.

## Diagnostic Error Messages

None.

## Exit status

It always exits with status 0.

## Known bugs

There is a slight memory leak that must be fixed at some time. This does no affect the results.

## See also

Program name | Description
--- | ---
coderet | Extract CDS, mRNA and translations from feature tables
extractfeat | Extract features from a sequence
maskfeat | Mask off features of a sequence
showfeat | Show features of a sequence

## Author(s)

Gary Williams (gwilliam © hgmp.mrc.ac.uk)
HGMP-RC, Genome Campus, Hinxton, Cambridge CB10 1SB, UK

## History

Written (2002) - Gary Williams

## Target users

This program is intended to be used by everyone and everything, from naive users to embedded scripts.