Who needs stem cells when you can grow whole organs from scratch? Scientists have now mastered the art of growing cells over a properly shaped framework to form a replacement organ. This process requires samples from a source organ in the body and cells from one organ cannot be used to grow into a different type of organ. The cells are already typed, not being stem cells, and only know how to be what they already were (I think… the reports were vague on that).

http://news.nationalgeographic.com/news/2006/04/0404_060404_bladders.html

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