下图为哺乳动物胚胎工程的有关操作流程。下列叙述正确的是 A . 1 过程运用超数排卵技术可得到多个胚胎 B . 3 过程可以用胃蛋白酶处理囊胚获得干细胞 C . 4 过程可以在饲养层细胞上培养 D . 5 过程可以直接获得各种效应 T 细胞
A.
1
B.
2
C.
3
D.
4
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