Thousands wait in vain for organ transplants; soldiers return from battle horribly maimed. There is only so much medicine can do, but we may be on the path to a new technology in which quite literally, we will be growing new body parts. It's called "regenerative medicine," where cells in the human body are manipulated into regrowing tissue.
As we first reported last December, researchers have so far created beating hearts, ears and bladders. Biotech companies and the Pentagon have invested hundreds of millions of dollars in research that could profoundly change millions of lives.
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