Impaired Motor Coordination in Mice Lacking Neural Recognition Molecule NB-3 of the Contactin/ F3 Subgroup Yasuo Takeda, 1 Keiko Akasaka, 1,3 Suni Lee, 1,4 Satoru Kobayashi, 1 Hitoshi Kawano, 5 Shigeo Murayama, 2 Naoki Takahashi, 3 Kouichi Hashimoto, 6 Masanobu Kano, 6 Masahide Asano, 7 Katsuko Sudo, 8 Yoichiro Iwakura, 8 Kazutada Watanabe 1,9 1 Department of Cell Recognition, Tokyo Metropolitan Institute of Gerontology, Sakaecho, Itabashi-ku, Tokyo 173-0015, Japan 2 Department of Neuropathology, Tokyo Metropolitan Institute of Gerontology, Sakaecho, Itabashi-ku, Tokyo 173-0015, Japan 3 Department of Metabolic Regulation in Animal Cells, Nara Institute of Science and Technology, Takayama, Ikoma, Nara 630-0101, Japan 4 Department of Applied Biological Science, Tokyo University of Agriculture and Technology, Saiwaicho, Fuchu, Tokyo 183-8509, Japan 5 Department of Anatomy and Embryology, Tokyo Metropolitan Institute for Neuroscience, Musashidai, Fuchu, Tokyo 183-8526, Japan 6 Department of Physiology, Kanazawa University School of Medicine, Takaramachi Kanazawa 920-8640, Japan 7 Institute for Experimental Animals, Kanazawa University School of Medicine, Takaramachi Kanazawa 920-8640, Japan 8 Center for Experimental Medicine, Institute of Medical Science, University of Tokyo, Minato-ku, Tokyo 108-8639, Japan 9 Department of BioEngineeing, Nagaoka University of Technology, Nagaoka, Niigata 940-2188, Japan Received 31 October 2002; accepted 29 January 2003 The first two authors contributed equally to this work. Correspondence to: K. Watanabe (kazutada@vos.nagaokaut. ac.jp). Contract grant sponsor: Grants-in-Aid for Scientific Research from the Ministry of Education, Science, Sports and Culture of Japan. © 2003 Wiley Periodicals, Inc. DOI 10.1002/neu.10222 252