1. RIKEN BioResource Center, 3-1-1 Koyadai, Tsukuba, Ibaraki 305-0074, Japan
2. MARS Tohken X-Ray Inspection Co. Ltd., 2-27-7 Tamagawa, Chofu, Tokyo 182-0025, Japan
3. Tsukuba Gene Technology Laboratories, 6-446 Arakawaoki, Tsuchiura, Ibaraki 300-0873, Japan