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To what extent can humans, (mammals in general), theoretically regenerate, and is their a way to speed up and/or exceed this original extent.

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What do you mean by "theoretically"? Regenerate what? Toe nails, for example, are easily regenerated. Livers, less so. As it stands, this question is too broad for this site. –  terdon Jan 8 '13 at 17:10

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Regeneration - or actions perceived as regeneration by popular culture - depend highly on age and specific type of cells (epithelial tissue cells are a fine example). But you can't regenerate a leg-bone once removed.

But to get a more specific answer you to make a more specific question and define the terms you're using.

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