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Table 1 Comparison of the outcomes between 4- to 8-cell embryo injection and blastocyst injection

From: Generation of pig induced pluripotent stem cells using an extended pluripotent stem cell culture system

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%)