Re-growing human organs and body parts

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Many animals have the ability to re-grow body parts.  Often seen in the Pacific, the gecko, can easily lose its tail and just as easily grow a new one. 

As seen in this article, researchers are studying to make this a reality for humans.  In the example noted the Reasearcher was able to regrow a patient's finger with a power engineered from pig bladder.  Such research leads it way to regenerating human organs for medical use with goals to eliminate organ transplant by allowing the individual to regrow and repair their own organs.