Abstract: Embryos at different developmental stages are obtained by transplanting ?Xenopus laevis blastomere unclei to ?Bufo raddei unfertilized eggs.

• 文摘:将非洲爪蟾胚胎细胞核移入花背蟾蜍成熟未受精卵后，得到了发育至各期的胚胎。