Using a type of stem cell that can grow into any kind of human tissue given the right signals, Duke University researchers have grown a fully functional muscle patch for human hearts. The feat is a first in that the patch conducts electricity and contracts like natural heart cells. "This is the closest man-made approximation of native human heart tissue to date," said Nenad Bursac, associate professor of biomedical engineering at Duke's Pratt School of Engineering.

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