Table 1.

Genotyping frequency in each embryo stage and after wean (3 weeks old).

Stage	−/−	+/−	WT	Total	P	c2
After wean	0	117	57	174	2.50019E-13	–
E10.5	2	22	11	35	0.0310	6.943
E9.0	7	35	19	61	0.0486	6.049
ESC	6	10	4	20	0.8187	0.4

P: possibilities calculated by χ² tests (C2).