1. Human Stress Signal Research Center (HSS), National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba West, 16-1 Onogawa, Tsukuba 305-8569, Japan, Hokkaido University, Sapporo 060-8638, Japan, and HSS, AIST Kansai Center, 1-8-31, Midorigaoka, Ikeda 563-8577, Japan