1. Departments of Pharmacology and Cancer Biology, Duke University School of Medicine, Durham, NC 27710, USA.
2. Departments of Orthopaedic Surgery, Duke Orthopaedic Cellular, Developmental, and Genome Laboratories, Duke University School of Medicine, Durham, NC 27710, USA.
3. Center for Translational Pain Medicine, Department of Anesthesiology, Duke University Medical Center, Durham, NC 27710, USA.
4. Department of Cell Biology, Duke University School of Medicine, Durham, NC 27710, USA.