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Phosphodiesterase Family Tree (11 Families, 21 Subfamilies, 53 Isoforms)
| Phosphodiesterase | Subfamily | Splice Variants | |
|---|---|---|---|
| Family | |||
| All | 1 | A | 4 |
| discovered | 1 | B | 1 |
| pre-sildenafil | 1 | C | 5 |
| 2 | A | 3 | |
| 3 | A | 1 | |
| 3 | B | 1 | |
| 4 | A | 8 | |
| 4 | B | 3 | |
| 4 | C | 4 | |
| 4 | D | 5 | |
| 5 | A | 3 | |
| 6 | A | 1 | |
| 6 | B | 1 | |
| 6 | C | 1 | |
| All | 7 | A | 3 |
| discovered | 7 | B | 1 |
| post-sildenafil | 8 | A | 1 |
| 8 | B | 1 | |
| 9 | A | 4 | |
| 10 | A | 2 | |
| 11 | A | 4 |
