1. Department of Cancer Biology, University of Massachusetts Medical School, Worcester, MA, USA
2. Department of Cellular and Molecular Biochemistry, Center for Structural Biology, University of Kentucky, Lexington, KY, USA
3. The Jackson Laboratory, Bar Harbor, ME, USA
4. Program in Molecular Medicine, University of Massachusetts Medical School, Worcester, MA, USA
5. Department of Bioscience and Nutrition, Center for Biosciences, Karolinska Institute, Novum, Huddinge, Sweden
6. Department of Anatomy and Cellular Biology, Tufts University School of Medicine, Boston, MA, USA