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It's been done. A replacement trachea was grown from scratch in a bio reactor by bathing a man made structure in stem cells. Then transplanting. http://www.youtube.com/watch?v=R-qRRZfz4cM


"color" 3D printing, i.e. using different kind of cells that make up real liver

http://www.wired.co.uk/news/archive/2013-04/24/3d-printed-li...




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