Why Can't Humans Regrow Body Parts?

Science has made it possible to regrow human limbs and organs! How far away are we from being able to grow an entire human?

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Sources:
http://www.salk.edu/news-release/what-can-the-water-monster-teach-us-about-tissue-regeneration-in-humans/
http://www.livescience.com/1985-salamanders-sprout-limbs.html
https://www.depts.ttu.edu/biology/people/Faculty/Held/RegrowingHumanLimbs.pdf
http://animals.howstuffworks.com/amphibians/salamander-regrow-body-parts1.htm
http://regeneration.bio.uci.edu/when-we-were-embryos-2/
http://health.howstuffworks.com/human-body/systems/musculoskeletal/extracellular-matrix.htm
http://www.seeker.com/why-cant-humans-regenerate-body-parts-1767727453.html

Written by Michael Sago

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