1. National Center for Genome Resources, Santa Fe, NM 87505
2. Department of Protective Medicine, Nanjing Army Medical College, Second Army Medical University, Nanjing, Jiangsu 210099, China
3. Computational Biology Branch, National Center for Biotechnology Information, National Library of Medicine, National Institutes of Health, Bethesda, MD 20894
4. Computational Biology Branch, National Center for Biotechnology Information, National Library of Medicine, National Institutes of Health, Bethesda, MD 20894