Affiliation: | a Department of Experimental Biology, Tokyo Metropolitan Institute of Gerontology. Sakaecho 35-2, Itabashi-ku, Tokyo 173, Japan b Department of Sericultural Science, Faculty of Agriculture, Kyushu University, Hakozaki 6-10-1, Fukuoka, Japan c Department of Biology, Faculty of Science, Kanazawa University, Kakamamachi, Kanazawa, Japan |