A lack of suitable donors for transplants, particularly as cars get safer and first-aid becomes more effective, means the supply of such organs is limited.
One promising approach is to print them. As yet, such ?bioprinting? remains largely experimental. But bioprinted tissue is already being sold for drug testing, and the first transplantable tissues are expected to be ready for use in a few years? time.
http://www.economist.com/news/science-and-technology/21715638-how-build-organs-scratch?
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