Table 1. Mendelian inheritance of the mutant Lmnb1 allele (Δ) in intercrosses of heterozygous mutant mice.

Age of embryos, dpc	Lmnb1+/+	Lmnb1+/Δ	Lmnb1Δ/Δ
14.5	13	21	12
16.5	4	11	4
18.5	14	33	14