Table S1.
Fertility test
| Genotype | No. of mice | No. of litters | No. of pups | Mean pups per litter | Mean litter per mouse |
| Pgr+/+Rosa26N1ICD/N1ICD | 5 | 27 | 203 | 7.53 ± 0.49 | 5.40 ± 0.54 |
| Pgr+/+Rosa26N1ICD/+ | 3 | 17 | 137 | 8.06 ± 0.96 | 5.67 ± 0.58 |
| PgrCre/+Rosa26N1ICD/N1ICD | 4 | 0 | 0 | 0 | 0 |
| PgrCre/+Rosa26N1ICD/+ | 4 | 0 | 0 | 0 | 0 |
Note the 6-mo breeding protocol.