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Embryonic stem cell - Wikipedia, the free encyclopedia 來源:http://weibo.com/u/2394069222Embryonic stem cells (ES cells) are pluripotent stem cells derived from the inner cell mass of a blastocyst, an early-stage preimplantation embryo.[1][2] Human embryos reach the blastocyst stage 4–5 days post fertilization, at which time they consist of 5...
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