1. Program of Basic Biology, Graduate School of Integrated Sciences for Life, Hiroshima University, Higashi Hiroshima, Hiroshima 739-8526, Japan
2. Marine Genomics Unit, Okinawa Institute of Science and Technology Graduate University, Onna, Okinawa 904-0495, Japan
3. Marine Biological Laboratory, Graduate School of Integrated Sciences for Life, Hiroshima University, Onomichi, Hiroshima 722-0073, Japan