1. Department of Molecular Life Science, Division of Basic Medical Science and Molecular Medicine, Tokai University School of Medicine, 143 Shimokasuya, Isehara, Kanagawa 259-1193, Japan
2. Section of Gene Expression Regulation, Frontier Science Research Center, Kagoshima University, 1–21–20 Korimoto, Kagoshima, Kagoshima 890-0065, Japan
3. Department of Genetics, Cell Biology and Anatomy, University of Nebraska Medical Center, Omaha, NE 68198, USA