If we make skin and muscle cells when we heal cuts and heal/generate bones after breaking them, why wouldn’t we be able to grow a finger if one is cut off?
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Your finger forms while you are still a fetus, the conditions to grow entire new one when you lose your finger as an adult are not there anymore. Interestingly enough, it’s sometimes possible to regrow tip of a finger provided a bit of nail is still intact from injury. There is continuous growth from stem cells going on in a nail and that can guide reforming the tip of a finger.
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