1. Nutritional Sciences and Toxicology, University of California, Berkeley, California 94720, Center for BioIron at CHORI (Children's Hospital Oakland Research Institute), Oakland, California 94609, Hubbard Center for Genome Studies, University of New Hampshire, Durham, New Hampshire 03824, Eon/Terragenomics, Davis, California 95616, and Environmental Laboratory, U.S. Army Engineer Research and Development Center, Vicksburg, Mississippi 39180