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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You can, to some extent. I just went to a medical conference in which they discussed this very thing. The presenter showed some before and after pictures of fingertips that were cut off, a few losing as much as back to the beginning of the fingernail. They showed slightly less than perfect results, maybe a little misshapen, but surprisingly good, even with a fingernail. The key, as was explained, is to not try to sew it up, but to have a good scab form over the end and just keep it protected and clean.
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