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Call me weird, but I just bought a tarantula a couple of days ago. I used to have one years ago and if they lose a leg, it usually, if not always grows back after molting. Infact, there's several species in the animal kingdom that can regenerate lost body parts, and when this happens (usually in lizards) the epidermal cells around the wound migrate in to close it without creating scar tissue. The different cell types revert to stem cells in order to form a blastema that will later turn into a new limb and so on. In humans, like the human heart, it forms a scar after a heart attack rather than new muscle, and every year people die from complications related to scarring. What about the human finger, when it's kept clean and unstitched? It can grow back. Do you think scientist can develop something to regenerate body parts? What about cloning body parts?
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