Table 1. Genotypes of the offspring from Trip12^+/mt intercrosses.

	No. of mice with the following
	genotype:
Age	+/+	+/mt	mt/mt	Absorbed	Empty	Total
E7.5	7 (23.3%)	17 (56.6%)	6 (20.0%)	0	0	30
E8.5	3 (27.3%)	6 (54.5%)	2 (18.2%)	0	0	11
E9.5	15 (31.3%)	23 (47.9%)	8 (16.7%)	0	2 (4.1%)	48
E10.5	18 (32.7%)	30 (54.5%)	6 (10.9%)	0	1 (1.8%)	55
E11.5	9 (27.3%)	15 (45.5%)	0	9 (27.3%)	0	33
E12.5	2 (28.6%)	2 (28.6%)	0	3 (42.9%)	0	7
E13.5	4 (26.7%)	9 (60.0%)	0	2 (13.3%)	0	15
Newborn	4 (30.8%)	9 (69.2%)	0	-	-	13
3 weeks	17 (36.2%)	30 (63.8%)	0	-	-	47

Percentage shows the ratio of each genotype in total number of embryos in each developmental stages.