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Sore knees?  Can't run? Bad hip? Need replacement? Shoulder injuries?  Why doesn't the body reproduce cartilage as it does when you are a teenager? 

Well guess what, it does.   New research from A Stanford University study shows a breakthrough in stimulating stem cells and actually regrowth of cartilage. Maybe you won't need that knee or hip operation one day in the future. 

We talk to researchers Dr. Matthew  Murphy currently at The University Manchester, and  Charles Chan Assistant Prof. at Stanford's Palo Alto campus in California.

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