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1) Embryonic stem cells are pluripotent stem cells derived from the inner cell mass of the blastocyst,an early stage embryo. Human embryos reach the blastocyst stage 4-5 days post fertilization, at which time they consist of 50-150 cells. Human ES cells are approximately 14 μm to 8 μm .two diploid ES cell lines have been cultivated.
Pre implantation development consists of stages of mammalian development, before the embryo implants into the mother’s uterus. It starts with fertilization of the egg by the sperm, and takes place as the embryo travels among the oviduct towards the uterus. It lasts 4.5 days in the mouse, and the best studied model, and 6 days in humans....
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