REGROW YOUR OWN:

Stem cell therapy has long captured the limelight as a way to the goal of regenerative medicine, that of repairing the body with its own natural systems. But a few scientists, working in a relatively obscure field, believe another path to regenerative medicine may be as likely to succeed. The less illustrious approach is promising, in their view, because it is the solution that nature itself has developed for repairing damaged limbs or organs in a wide variety of animals. . . .

Mammals, too, can renew damaged parts of their body. All can regenerate the liver. Deer regrow their antlers, some at the rate of 2 centimeters a day, said to be the fastest rate of organ growth in animals. In many of these cases, regeneration begins when the mature cells at the site of a wound start to revert to an immature state. The clump of immature cells, known as a blastema, then regrows the missing part, perhaps by tapping into the embryogenesis program that first formed the animal.

Bring it on. It would be nice if we could regenerate our whole bodies, bit by bit.