1. Department of Pharmacology and Chemical Biology, School of Medicine, University of Pittsburgh, Pittsburgh, PA 15261, USA.
2. Graduate Program in Molecular Pharmacology, School of Medicine, University of Pittsburgh, Pittsburgh, PA 15261, USA.
3. Graduate Program in Molecular Biology and Structural Biology, School of Medicine, University of Pittsburgh, Pittsburgh, PA 15261, USA.
4. Endocrine Research Unit, Department of Veterans Affairs Medical Center, and University of California, San Francisco, CA 94158, USA.
5. Department of Chemistry, University of Wisconsin-Madison, Madison, WI 53706, USA.
6. Department of Computational and Systems Biology, University of Pittsburgh School of Medicine, Pittsburgh, PA 15260, USA.
7. Endocrine Unit, Massachusetts General Hospital and Harvard Medical School, Boston, MA 02114, USA.