One gene lost = one limb regained? Scientists demonstrate mammalian regeneration through a single gene deletion

The absence of a single gene, called p21, confers a healing potential in mice long thought to be reserved only for creatures like flatworms, sponges, and some species of salamander: regeneration. Researchers demonstrate that mice that lack the gene can regenerate lost or damaged tissue, suggesting that such an ability may be granted to mammals by blocking the effects of p21.

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