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Embryonic stem cells are

User Keysersoze
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Embryonic stem cells (ES cells or ESCs) are pluripotent stem cells derived from the inner cell mass of a blastocyst, an early-stage pre-implantation embryo. Human embryos reach the blastocyst stage 4–5 days post fertilization, at which time they consist of 50–150 cells. Hope I’ve helped ;)
User Nikhil Kinkar
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