1. Bone Tissue Engineering Center (J.J., D.D, P.C.), Carnegie Mellon University, Pittsburgh, Pennsylvania 15213
2. Institute for Complex Engineered Systems (J.J., J.S., P.C.), Carnegie Mellon University, Pittsburgh, Pennsylvania 15213
3. Department of Biological Sciences (J.J.), Carnegie Mellon University, Pittsburgh, Pennsylvania 15213
4. Endocrine Research Unit (C.C.), The Mayo Clinic and Foundation, Rochester, Minnesota 55905