The improvement from donated kidneys to bioengineered ones is that the body of the person receiving the kidney will not have to endure a life time of pills to make their body accept the kidney. The new kidney will be made up of their own cells.
This is a previously decellularized rat kidney after attempts to repopulate the organ's vascular system.
http://www.sciencedaily.com/releases/2013/04/130414193433.htm
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