Affiliation: | aDepartment of Anatomy, University of California, San Francisco, CA, 94158;bDivision of Dermatology, San Francisco Veteran’s Administration Medical Center, San Francisco, CA, 94121;cDepartment of Dermatology, University of California, San Francisco, CA, 94158;dDepartment of Microbiology and Immunology, University of California, San Francisco, CA, 94158 |