These extra cells can form a mass of tissue called a growth or tumor.
这些额外的细胞可以形成一个组织团块称为增生或肿瘤。
If you've got extra cells of one type and need another, why go all the way back to a stem cell?
如果你有一种类型的多余细胞，还需要另外一种类型的细胞，干嘛还要回到干细胞上去呢？
If you've got extra cells of one type and need another, why go all the way back to a stem cell?
如果你有一种类型的多余细胞，还需要另外一种类型的细胞，干嘛还要回到干细胞上去呢？
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