人的生命是从一个小小的受精卵开始,经过有丝分裂形成8个细胞卵裂球,进而分化成胚泡(blastocyst)。从胚泡内的内细胞团(inner cell mass,ICM)提取出来的人胚胎干细胞具有多向分化的潜能,能够参与全身机体的200多种组织的形成。然而,人胚胎干细胞的提取需要破坏已 Human life starts with a tiny zygote, splitting into eight cytoplasmic blastomeres through mitosis, and then differentiating into blastocyst. Human embryonic stem cells, extracted from the inner cell mass (ICM) in the blastocyst, have the potential of multidirectional differentiation and are capable of participating in the formation of more than 200 tissues throughout the body. However, the extraction of human ES cells requires destruction