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【单选题】
胚胎干细胞是指 [ ]A.
胚胎中的细胞
B.
来自人或动物的早期胚胎或某些器官中，具有自我复制和多向分化潜能的原始细胞
C.
具有全能性的细胞
D.
分化程度最高的细胞
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A.
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B.
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A.
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