Affiliation: | (1) Division of Dermatology, Department of Medicine, University of California, The Center for the Health Sciences, Los Angeles 24, California, U.S.A.;(2) Medical Service, Veterans' Administration Service, General Medical and Surgical Hospital, Los Angeles 25, California, U.S.A.;(3) Department of Botany and Plant Biochemistry, University of California, Los Angeles 24, California, U.S.A. |