1. From the Department of Orthopedic Surgery (A.K., Y.H.), the Center for Molecular Medicine (T.O., Y.K., S.M., J.M., Y.S.), and the Department of Physiology (K.S.), Jichi Medical University School of Medicine, Tochigi, and the Department of Clinical Laboratory Medicine (R.O., Y.Y.), Graduate School of Medicine, University of Tokyo, Tokyo, Japan.