1. National Institute of Genetics, Graduate University for Advanced Studies, Sokendai, Yata 1111, Mishima, Shizuoka 411-8540, Japan.
2. Department of Medical Chemistry, Kansai Medical University, Hirakata, Osaka 573-1010, Japan.
3. Department of Medical Neurobiology, IMRIC, Hebrew University - Hadassah Medical School, Jerusalem, Israel.