U.S. scientists have grown a piece of heart muscle — and then watched it beat — by using stem cells from a mouse embryo, a big step toward one day repairing damage from heart attacks.
Think of Dr. Kenneth Chien as a heart mechanic. "We're making a heart part and (eventually) we're going to put the part in," is how he describes the work by his team of Harvard University and Massachusetts General Hospital researchers.
Lots of work remains before trying that dramatic an experiment in people. But regenerating damaged heart muscle is a holy grail in cardiac care.











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