The abundance of transcription units in human, mouse, and rat
Transcription units | Polyadenylated | Tandem poly(A) sites | Composite exons | Hidden exons | Truncated exons | Alternatively polyadenylated |
|---|---|---|---|---|---|---|
| Human | 13,268 | 5521 | 1084 | 650 | 794 | 6535 (49%) |
| Mouse | 9227 | 2532 | 233 | 138 | 355 | 2898 (31%) |
| Rat | 2611 | 621 | 87 | 57 | 59 | 710 (28%) |
[i] The percentages of alternative polyadenylation are calculated relative to the polyadenylated transcription units.