Affiliation: | (1) Environmental Physiology Department, Naval Medical Research Center, 503 Robert Grant Avenue, Silver Spring, MD 20910-7500, USA;(2) Present address: School of Biosciences, University of Birmingham, Birmingham, B15 2TT, UK;(3) Present address: National Center for Research Resources, National Institutes of Health, 6701 Democracy Boulevard, Room 924, Bethesda, MD 20892-4874, USA |