Human Regeneration

Scientists believe, in theory at least, that if you could switch of the p21 gene in humans, we would have the ability to regenerate our severed limbs in the same capacity as Newts. 

The downside? 

Well “p21 is closely intertwined with another gene, p53, a cell-division regulator that, if allowed to run amok, can lead to many types of cancers. The p21 gene acts as a safety valve for p53, stopping cell division in the case of DNA damage.”  So, the trade off for having cellular regeneration would be lots of cancer.

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