«Under normal circumstances,
myofibroblasts stimulate wound healing, but when there's an ongoing injury to an organ (e.g., the liver of a hepatitis C patient, the heart of a patient with high blood pressure, or the kidney of a patient with diabetes) these proteins clog up normal functioning,» said Humphreys, a Harvard Medical School associate professor at Brigham and Women's Hospital, who leads the Harvard Stem Cell Institute Kidney Program.