Table 1.
Sequence Classes
| Class | Sequence type | PolyA signal and/or tail | Annotation |
| 1 | well-characterized mRNA/cDNA | n/a | n/a |
| 2 | EST | yes | 3′ |
| 3 | EST | yes | none |
| 4 | EST | yes | 5′ |
| 5 | EST | no | 3′ |
Sequence Classes
| Class | Sequence type | PolyA signal and/or tail | Annotation |
| 1 | well-characterized mRNA/cDNA | n/a | n/a |
| 2 | EST | yes | 3′ |
| 3 | EST | yes | none |
| 4 | EST | yes | 5′ |
| 5 | EST | no | 3′ |