1. Department of Mathematical and Life Sciences; Graduate School of Science; Hiroshima University; 1-3-1 Kagamiyama; Higashi-Hiroshima; Hiroshima 739-8526; Japan
2. Center for iPS Cell Research and Application (CiRA); Kyoto University; 53 Shogoin-Kawahara-cho; Sakyo-ku; Kyoto 606-8507; Japan
3. Institute for Amphibian Biology; Graduate School of Science; Hiroshima University; 1-3-1 Kagamiyama; Higashi-Hiroshima; Hiroshima 739-8526; Japan
4. Laboratory for Morphogenetic Signaling; RIKEN Center for Developmental Biology; 2-2-3 Minatojima-minamimachi; Chuo-ku; Kobe; Hyogo 650-0047; Japan
5. Department of Genetics and Cell Biology; Research Institute for Radiation Biology and Medicine; Hiroshima University; 1-2-3 Kasumi; Minami-ku; Hiroshima 734-8553; Japan
6. Department of Biology; Research and Education Center for Natural Sciences; Keio University; 4-1-1 Hiyoshi; Kohoku-ku; Yokohama 223-8521; Japan
7. Shimoda Marine Research Center; University of Tsukuba; 5-10-1; Shimoda; Shizuoka 415-0025; Japan
8. Quantitative Biology Center; RIKEN; 6-2-3 Furuedai; Suita; Osaka 565-0874; Japan