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| genotype | % | n |
| wild type | 0 | 220 |
| Ppt1Df(1)446-20 | 36.4 | 220 |
| Ppt1Df(1)446-20/+ | 0 | 220 |
| Ppt1A179T | 16 | 198 |
| Ppt1A179T/+ | 0 | 220 |
| Ppt1S77F | 17 | 198 |
| Ppt1S77F/+ | 0 | 220 |
| Ppt1S77F/Ppt1Df(1)446-20 | 12 | 220 |
| Ppt1A179T/Ppt1Df(1)446-20 | 12 | 374 |
n, number of hemisegments at stage 14–16.
