Affiliation: | 1. Department of Molecular Biology, Keio University School of Medicine, 35 Shinanomachi, Shinjuku-ku, Tokyo 160, Japan 2. Institute for Protein Research, Osaka University, 3-2 Yamadaoka, Suita, Osaka 565, Japan 3. Department of Molecular and Cellular Biology, University of Arizona, 85721, Tucson, Arizona, USA
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