Loss of cartilage structure, stiffness, and frictional properties in mice lacking PRG4.
Coles JM, Zhang L, Blum JJ, Warman ML, Jay GD, Guilak F, Zauscher S. Loss of cartilage structure, stiffness, and frictional properties in mice lacking PRG4. Arthritis Rheum. 2010 Jun; 62(6):1666-74.