Institution: | a Institute of Biomedical Engineering, Tokyo Women's Medical College, Kawada-cho, 8-1, Shinjuku-ku, Tokyo 162, Japan b Nippon Kayaku Co. Ltd., Iwahana 219, Takasaki-shi, Gunma 370-12, Japan c Department of Materials Science and Technology, Faculty of Industrial Science and Technology, Science University of Tokyo, Yamazaki 2641, Noda-shi, Chiba 278, Japan d International Center for Biomaterials Science (ICBS), in Research Institute for Biosciences, Science University of Tokyo, Yamazaki 2669, Noda-shi, Chiba 278, Japan |