http://www.popsci.com/science/article/2011-05/flatworm-regenerates-new-body-single-cell
Worms have always been known for their ability to regenerate themselves if they are cut in half, but A new study has found that a flat worm can build an entirely new body from a single cell. It is the first time a cell similar to a stem cell has been found in an adult animal, and could pave the way for regeneration of human tissue. I certainly want to be able to grow back an arm if I lose one.
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