Affiliation: | (1) Department of Genetics, North Carolina State University, 27607 Raleigh, North Carolina, USA;(2) Present address: Environmental Mutagenesis Branch, National Institute of Environmental Health Sciences, 27709 Research triangle Park, North Carolina;(3) Present address: Department of Biology, Kyushu University, 812 Fukuoka, Japan;(4) Present address: Research Triangle Institute, 27709 Research Triangle Park, North Carolina |