Table 3. Proportion of Genes Subject to Recurrent Positive Selection.
| Group | All | Secreted | Not Secreted |
|---|---|---|---|
| Whole genome | 205/6110 (3.4%)a | 73/1446 (5.0%) | 132/4664 (2.8%) |
| Epididymis expressed | 77/2786 (2.8%) | 23/567 (4.1%) | 54/2219 (2.4%) |
| Epididymis specialized | 22/461 (4.8%) | 13/164 (7.9%) | 9/297 (3.0%) |
| Epididymis selective | 4/77 (5.2%) | 1/35 (2.9%) | 3/42 (7.1%) |
| Epididymis exclusive | 1/21 (4.8%) | 0/12 (0.0%) | 1/9 (11.1%) |
| Segmentally regulated | 22/451 (4.9%) | 13/161 (8.1%) | 9/290 (3.1%) |
a
This ratio was taken as the null expectation in all statistical comparisons, so that different gene groups could be compared with the same null.