1. Department of Biology, University of Pennsylvania, Philadelphia, PA;
2. Department of Pathology and Laboratory Medicine, Temple University Lewis Katz School of Medicine, Philadelphia, PA;
3. Division of Hematology-Oncology, Department of Medicine, University of Pennsylvania School of Medicine, Philadelphia, PA; and
4. Center for Metabolic Disease Research, Department of Pharmacology, Temple University Lewis Katz School of Medicine, Philadelphia, PA