TABLE 1.

Numbers of newborns or embryos and their corresponding genotypes and aspects at different stages of development

Stage	No. of embryos or newborns with genotype:					Aspecta
	Total	Sf/+	Sf/+: Cre	Sf/Sf	Sf/Sf: Cre
E9.5	57	18	16	15	8	8N
E10.5	63	14	19	18	12	3H; 2R; 7N
E11.5	61	11	14	19	17	10H; 7R
E12.5	28	7	9	8	4	4R
Newborn	16	6	5	5	0

^aN, normal; H, hemorrhagic; R, resorbed. Values refer to animals with S^f/S^f: Cre genotype.