Excerpt
GWEN IFILL (Newshour): Next, a development that could be good news for millions of heart attack victims. Scientists announced they have managed to convert damaged tissue into functioning heart muscle.
The research appeared today in the science journal Nature.
NewsHour correspondent Spencer Michels has our story, produced in collaboration with KQED San Francisco's QUEST program.
And a note: Some of the pictures of the medical procedures are graphic.
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