| Exon | a feature representing an exon |
| ExonI | Interface for a feature representing an exon |
| GeneStructure | A feature representing an arbitrarily
complex structure of a gene |
| GeneStructureI | A feature representing an arbitrarily
complex structure of a gene |
| Intron | DESCRIPTION of Object |
| NC_Feature | DESCRIPTION of Object |
| Poly_A_site | DESCRIPTION of Object |
| Promoter | Describes a promotor |
| Transcript | A feature representing a transcript |
| TranscriptI | Interface for a feature representing a
transcript of exons, promoter(s), UTR, and a poly-adenylation site. |
| UTR | A feature representing an untranslated region
that is part of a transcription unit |