This powder is a medical product called extracellular matrix. Made from pig bladders, it is a mix of protein and connective tissue surgeons often use to repair tendons. But it's the matrix's unusual power to regenerate tissue that's helping launch a new field: regenerative medicine.
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If this helped Mr Spievak's finger re-grow, could you grow a whole limb?
"In theory," Badalyk said.
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