Contact: Rex Graham
University of California - San Diego
Caption: Gayle E. Nugent-Derfus, now an engineer at Genentech, and UCSD bioengineering professor Robert Sah showed that shear forces on cartilage prompt chondrocyte cells to produce proteoglycan 4, a molecule that lubricates and protects joint surfaces.
Credit: UC San Diego
Usage Restrictions: Credit: UC San Diego
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