Stem cells do not just come from human embryo, but also found in most body and extra embryonic tissues and membranes. What separates stem cells from other cells is its ability to self renew or make more of them without ageing. Normally when cell divides the DNA loses its end tips known as the telomeres,and this thought to be what makes cell age, these things doesn't happen in stem cells, but still retain the same length. this is one thing that no other body cell can do.
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