1. Center of Molecular Biosciences; Tropical Biosphere Research Center; University of the Ryukyus; Nishihara Okinawa 903-0213 Japan
2. Laboratory of Cell and Functional Biology; Faculty of Science; University of the Ryukyus; Nishihara Okinawa 903-0213 Japan
3. Initiative Research Unit; College of Science; Rikkyo University; Nishi-Ikebukuro Tokyo 171-8501 Japan