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| Strain | Age | +/+ | +/− | −/− |
|---|---|---|---|---|
| 129S4 (129) | P21 | 29 (26%) | 66 (58%) | 18 (16%) |
| C57Bl/6J (B6) | E17.5 | 11 (21%) | 35 (66%) | 7 (13%) |
| P14 | 23 (31%) | 53 (69%) | 0 (0%) | |
| 129 × B6 F1 | P21 | 22 (23%) | 51 (53%) | 23 (24%) |
P, postnatal day; E, embryonic day.
