1. S. Kuroda, Division of Signal Transduction, Nara Institute of Science and Technology, Ikoma 630-0101, Japan, and Inheritance and Variation Group, PRESTO, Japan Science and Technology, Kyoto 619-0237, Japan. M. Fukata, Division of Signal Transduction, Nara Institute of Science and Technology, Ikoma 630-0101, Japan, and Department of Biochemistry, Hiroshima University School of Medicine, Hiroshima 734-8551, Japan. M. Nakagawa, K. Fujii, T. Nakamura, T. Ookubo, K. Kaibuchi, Division of Signal...