Table 3. Distribution of genes according to splice variation.
| Splice variation classification | No. of genes containing isoform type |
|---|---|
| Alternate acceptor and/or donor | 549 |
| Unspliced introns | 386 |
| Alternate terminal exons | 61 |
| Exon skipping | 53 |
| Start or end within intron | 288 |
These categories are not mutually exclusive; 131 genes belong to two or more categories due to multiple variations within single isoforms or within multiple isoforms of a single gene which fall into distinct categories. These categories are listed in order of correspondence to the illustrations in figure 2 of Haas et al. (17).