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EISUKE GOTOH
Division of Genetic Resources, National Institute of Health Japan, Toyama, Shinjukuku, Tokyo 162, Japan Department of Radiology, The Jikei University School of Medicine, Nishishinbashi, Minatoku, Tokyo 105, Japan
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YOHKO ASAKAWA
Division of Genetic Resources, National Institute of Health Japan, Toyama, Shinjukuku, Tokyo 162, Japan
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HIROSHI KOSAKA
Laboratory of Cell Growth and Differentiation, Tsukuba Life Science Centre, The Institute of Physical and Chemical Research (RIKEN), Koyadai, Tsukuba, Ibaraki 305, Japan