Table 1.

Emb^−/− mice are fertile

Emb−/− breeding pairs	10
Emb−/− breeding pairs with survived litters	6
Cannibalized litters	10
Litters with survived pups	13
Survived female pups	14
Survived male pups	16
Average litter size	2.3

Ten Emb^−/− homozygous breedings were followed until the pups were genotyped at P14-P21.