A living 'robofish' that's built from human cardiac cells and swims just like a fish could pave the way for artificial hearts, a new study reveals.Created by researchers at Harvard University, the 'biohybrid' recreates muscle contractions of a pumping human heart to push its tail fin side to side.Under half an inch long, it's made of plastic fins and a paper spine, but on either side are two strips of living heart cardiac muscle cells that perform these contractions.
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