1. T. Kubori, Y. Matsushima, D. Nakamura, S.-I. Aizawa, Department of Biosciences, Teikyo University, 1-1 Toyosatodai, Utsunomiya 320, Japan.
2. J. Uralil, M. Lara-Tejero, A. Sukhan, J. E. Galán, Department of Molecular Genetics and Microbiology, School of Medicine, State University of New York, Stony Brook, NY 11794, USA.