Lizards can detach their tails and regrow them, just as other amphibians can regenerate limbs, and now humans may soon be able to.
Researchers studying mice, discovered that stem cells beneath the nail were crucial to digit regrowth. The base of the mice's nails house stem cells, and special proteins in the Wnt signaling pathway (which are very active in embryonic nail and limb growth in the womb) have been the focus of new testing. "Normal" mice were able to regenerate their toe and toenails five weeks after amputation, but subjects treated with a drug to block the pathway as well as mice whose digits were amputated too far back, were unable to regrow anything.
My guess is that they will find out how far back they can regrow a part, and then massage the stems cells to work past that point. And I beleive the natural conclusion once it's all said and done in the future is for guys to be chopping off their junk so that they can be regrown bigger...you heard it here first!
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