[1] UNIV TOKYO,INST MOL & CELLULAR BIOSCI,BUNKYO KU,TOKYO 113,JAPAN
[2] JAPANESE FDN CANC RES,CTR CANC CHEMOTHERAPY,TOSHIMA KU,TOKYO 170,JAPAN
[3] SANDOZ PHARMACEUT CO,SANDOZ RES INST,E HANOVER,NJ 07936
[4] SANDOZ PHARMA LTD,TSUKUBA RES INST,TSUKUBA,IBARAKI 30033,JAPAN