What determines whether something is small enough to regrow on a mammal?

I don’t get why is possible to regrow a lot of stuff (skin, muscles, broken bones etc.), but only to a certain extend. At one moment you are suddenly not able to rebuild things.

Why is that and what determines what we can regrow?

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partial_accumen
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5•10 hours ago
I think the general answer you’re looking for is Stem Cells.

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