1. Graduate School of Pharmaceutical Sciences; Tohoku University; 6-3, Aza-Aoba, Aoba-ku Sendai 980-8578 Japan
2. Research and Analytical Center for Giant Molecules, Graduate School of Science; Tohoku University; 6-3, Aza-Aoba, Aoba-ku Sendai 980-8578 Japan
3. Mushroom Research Laboratory; Hokuto Corporation; Nagano 381-0008 Japan