Table 1.

Comparison of the outcomes between 4- to 8-cell embryo injection and blastocyst injection

Chimera type	Total no. of chimera embryos transplanted into recipient mice	Total no. of recipient mice	Total no. of pregnant mice	Total no. of normal fetuses recovered	Total no. of other recovered (implantation site without a definable embryo, necrotic or reabsorbing implantation)	Total no. of pregnant mice/total no. of recipient mice (%)	Total no. of normal fetus recovered/total no. of chimera embryos transferred (%)	(Total no. of normal fetuses + total no. of other recovered)/total no. of chimera embryos transplanted (%)	Total no. of normal fetus recovered/(total no. of normal recovered + total no. of others recovered) (%)
Mouse 4- to 8-cell embryo injection	240	14	4	8	24	4/14 (28.57%)	8/240 (3.33%)	(8 + 24)/240 (13.33%)	8/(8 + 24) (25%)
Mouse blastocyst injection	241	15	7	48	37	7/15 (46.67%)	48/241 (19.92%)	(48 + 37)/241 (35.27%)	48/(48 + 37) (56.47%)