"Humans have very limited ability to regenerate heart muscle cells, which is a key reason why heart attacks that kill cells and scar heart tissue are so dangerous." -Science Daily. They took a zebrafish to see what they could possibly do about its broken heart."Our hearts don't seem so complex that they shouldn't have the capacity to regenerate," said Kenneth Poss, Ph.D., senior author of the study in Nature and professor of cell biology at Duke. The people at the hospital have said that the cells in the heart are found in the cells that activate the gata 4 gene and this regenerates the inujured heart.
http://www.sciencedaily.com/releases/2010/03/100324142010.htm
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