A:心肌细胞
B:神经细胞
C:早期胚胎细胞
D:肝细胞
He realized his mistakes and took action to reduce the loss _________ it was too late.
下列有关克隆绵羊“多莉”诞生的叙述正确的是 ( )①属无性繁殖 ②采用了核移植技术 ③采用了胚胎移植技术 ④采用了胚胎分割技术⑤采用了胚胎体外培养技术 ⑥采用了体外受精技术