1. Departments of Orthopedics and Cell Biology (T.S., V.G., R.B., W.C.H.), Yale University School of Medicine, New Haven, Connecticut 06520
2. Department of Endocrinology (T.S., A.M.F.), Hospital Bergmannsheil, Ruhr University Bochum, 44789 Bochum, Germany
3. Department of Molecular Pharmacology (M.P., D.F.M.), Division of Biology and Medicine, Brown University, Providence, Rhode Island 02912