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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Regrowing a finger requires the generation of muscle, bone, skin, and blood vessels. These would all need to be developed in tandem to ensure that the regrown finger functions as intended, looks like your finger used to look, and doesn’t actively hurt you.
On the other hand, regrowing skin cells is a comparatively easy task. That’s a simple repair in an area bordered by damaged cells, so it’s clear to the body where the repair needs to happen and what kinds of cells need to be repaired.
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