[1] TOKYO METROPOLITAN GERIATR MED CTR, DIV IMMUNOL, ITABASHI KU, TOKYO, JAPAN
[2] EIKEN CHEM CO LTD, TOKYO LAB, DIV RES & DEV, KATSUSHIKA KU, TOKYO, JAPAN
[3] PSYCHIAT RES INST TOKYO, SETAGAYA KU, TOKYO 156, JAPAN
[4] TOKYO METROPOLITAN GERIATR HOSP & INST GERONTOL, DEPT BIOL, ITABASHI KU, TOKYO 173, JAPAN
[5] TOYO JOZO CO LTD, RES LABS, OHITO, SHIZUOKA 41023, JAPAN
[6] UNIV TOKYO, BRAIN RES INST, DEPT PATHOL, TOKYO 113, JAPAN