Washington University in St. Louis - Division of Dermatology, Washington University in St. Louis - Division of Dermatology, Washington University in St. Louis - Center for the Study of Itch and Sensory Disorders, Washington University in St. Louis - Division of Infectious Diseases, Regeneron Pharmaceuticals Inc., Washington University in St. Louis - Department of Pathology and Immunology, Washington University in St. Louis - Division of Dermatology, Washington University in St. Louis - Division of Dermatology, Regeneron Pharmaceuticals Inc., Washington University in St. Louis - Division of Dermatology, Washington University in St. Louis - Division of Dermatology, Washington University in St. Louis - Center for the Study of Itch and Sensory Disorders, Washington University in St. Louis - Division of Dermatology, Washington University in St. Louis - Center for the Study of Itch and Sensory Disorders, Johns Hopkins University - The Solomon H. Snyder Department of Neuroscience, RIKEN Yokohama Institute - Laboratory for Cytokine Regulation, Washington University in St. Louis - Center for the Study of Itch and Sensory Disorders, Washington University in St. Louis - Department of Pathology and Immunology, Johns Hopkins University - The Solomon H. Snyder Department of Neuroscience, Washington University in St. Louis - Center for the Study of Itch and Sensory Disorders, Rutgers, The State University of New Jersey - Department of Cell Biology and Neuroscience, Regeneron Pharmaceuticals Inc., Washington University in St. Louis - Division of Infectious Diseases and Icahn School of Medicine at Mount Sinai