目的：胚胎干细胞可塑性强，但只能从胚胎中提取，来源受限使研究阻力加大。
OBJECTIVE: Embryonic stem cells (ESCs) have a strong plasticity, but only can extract from embryos. Limited sources intensify research resistance.
目的：胚胎干细胞可塑性强，但只能从胚胎中提取，来源受限使研究阻力加大。
OBJECTIVE: Embryonic stem cells (ESCs) have a strong plasticity, but only can extract from embryos. Limited sources intensify research resistance.
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