Researchers use stem cells to regenerate the external layer
"In 2012, we discovered that if we treated human stem cells with chemicals that sequentially activate and inhibit Wnt signaling pathway, they become myocardium muscle cells," said Xiaojun Lance Lian, assistant professor of biomedical engineering and biology, who is leading the study at Penn State. Myocardium, the middle of the heart' s three layers, is the thick, muscular part that contracts to drive blood through the body.

The Wnt signaling pathway is a group of signal transduction pathways made of proteins that pass signals into a cell using cell-surface receptors.

http://medicalxpress.com/news/2017-01-stem-cells-regenerate-external-layer.html
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