Howard Hughes Medical Institute, Children's Hospital, Boston, Massachusetts (D.E.C.); Department of Cellular and Molecular Pharmacology, University of California, San Francisco, California (D.J.); Department of Biological Chemistry, The Johns Hopkins University School of Medicine, Baltimore Maryland (C.M.); and Institut für Pharmakologie, Charité-Universitätsmedizin Berlin, Campus Benjamin Franklin, Berlin, Germany (G.S.)

Howard Hughes Medical Institute, Children's Hospital, Boston, Massachusetts (D.E.C.); Department of Cellular and Molecular Pharmacology, University of California, San Francisco, California (D.J.); Department of Biological Chemistry, The Johns Hopkins University School of Medicine, Baltimore Maryland (C.M.); and Institut für Pharmakologie, Charité-Universitätsmedizin Berlin, Campus Benjamin Franklin, Berlin, Germany (G.S.)

Howard Hughes Medical Institute, Children's Hospital, Boston, Massachusetts (D.E.C.); Department of Cellular and Molecular Pharmacology, University of California, San Francisco, California (D.J.); Department of Biological Chemistry, The Johns Hopkins University School of Medicine, Baltimore Maryland (C.M.); and Institut für Pharmakologie, Charité-Universitätsmedizin Berlin, Campus Benjamin Franklin, Berlin, Germany (G.S.)

Howard Hughes Medical Institute, Children's Hospital, Boston, Massachusetts (D.E.C.); Department of Cellular and Molecular Pharmacology, University of California, San Francisco, California (D.J.); Department of Biological Chemistry, The Johns Hopkins University School of Medicine, Baltimore Maryland (C.M.); and Institut für Pharmakologie, Charité-Universitätsmedizin Berlin, Campus Benjamin Franklin, Berlin, Germany (G.S.)