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Scientists Are Growing New Hearts in the Shells of Old Ones

A recelluarized heart. (Photo: Bernhard Jank, M.D., Ott Lab, Massachusetts General Hospital) For decades now, there's been an image of human regeneration being a few cells dividing in a petri dish, hopefully growing into a shiny new organ. But the truth is that scientists' work is a bit more macabre. To make a new organ, it helps to be working from a dead one. That goes for hearts, too.
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