1. Yamamoto Behaviour Genes Project, ERATO, JST, University of Hawaii, 3050 Maile Way, 408 Gilmore, Honolulu, HI 96822, USA
2. Laboratory of Biology, Hokkaido University of Education, Iwamizawa, Hokkaido 068-8642, Japan
3. Yamamoto Behaviour Genes Project, ERATO, JST, Mitsubishi Kasei Institute of Life Sciences, Machida, Tokyo 194-8511, Japan
4. School of Human Sciences and Advanced Institute for Science and Engineering, Waseda University, Tokorozawa, Saitama 359-1192, Japan