1. Division of Genome and Biodiversity Research, National Institute of Agrobiological Sciences (NIAS), Tsukuba, Ibaraki 305-8602, Japan
2. Department of Biological Science & Technology, Faculty of Industrial Science & Technology, Tokyo University of Science, Noda, Chiba 278-8510, Japan
3. College of Pharmacy, Nihon University, Funabashi, Chiba 274-8555, Japan
4. Plant Genome Mapping Laboratory, University of Georgia, 162R C A G T, Athens, GA 30605, USA