Affiliation: | 1.Division of Membrane Physiology, Department of Cell Physiology, National Institute for Physiological Sciences, Okazaki, Aichi 444-8787, Japan;2.Centre National de la Recherche Scientifique, Unité Mixte de Recherche 144, and 3.Institut Curie Centre de Recherche, 75248 Paris Cedex 05, France |