---
name: "Bio::SeqFeature::Gene::ExonI"
section: "3pm"
platform: "linux"
package: "libbio-perl-perl"
version: "1.7.8-1"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/Bio::SeqFeature::Gene::ExonI"
---

# Bio::SeqFeature::Gene::ExonI(3pm)

Interface for a feature representing an exon

## NAME

Bio::SeqFeature::Gene::ExonI - Interface for a feature representing an exon

## SYNOPSIS

See documentation of methods.

## DESCRIPTION

A feature representing an exon. An exon in this definition is transcribed and at least for one particular transcript not spliced out of the pre-mRNA. However, it does not necessarily code for amino acid.

## FEEDBACK

### Mailing Lists

User feedback is an integral part of the evolution of this and other Bioperl modules. Send your comments and suggestions preferably\
  to one of the Bioperl mailing lists. Your participation is much appreciated.

```
  bioperl-l@bioperl.org                  - General discussion
  http://bioperl.org/wiki/Mailing_lists  - About the mailing lists
```

### Support

Please direct usage questions or support issues to the mailing list:

*bioperl-l@bioperl.org*

rather than to the module maintainer directly. Many experienced and  reponsive experts will be able look at the problem and quickly  address it. Please include a thorough description of the problem  with code and data examples if at all possible.

### Reporting Bugs

Report bugs to the Bioperl bug tracking system to help us keep track the bugs and their resolution.  Bug reports can be submitted via the web:

```
  https://github.com/bioperl/bioperl-live/issues
```

## AUTHOR - Hilmar Lapp

Email hlapp@gmx.net

## APPENDIX

The rest of the documentation details each of the object methods. Internal methods are usually preceded with a \_

### is\_coding

```
 Title   : is_coding
 Usage   : if($exon->is_coding()) {
                   # do something
           }
 Function: Whether or not the exon codes for amino acid.
 Returns : TRUE if the object represents a feature translated into protein,
           and FALSE otherwise.
 Args    :
```

### cds

```
 Title   : cds()
 Usage   : $cds = $exon->cds();
 Function: Get the coding sequence of the exon as a sequence object.
           The returned sequence object must be in frame 0, i.e., the first
           base starts a codon.
           An implementation may return undef, indicating that a coding
           sequence does not exist, e.g. for a UTR (untranslated region).
 Returns : A L<Bio::PrimarySeqI> implementing object.
 Args    :
```