Affiliation: | (1) Present address: Institut de Physiologie et de Chimie Biologique, Université Louis Pasteur, Section Sciences, rue Descartes, Esptanade, F-67000 Strasbourg, France;(2) Present address: Laboratoire de Cytologie animale, Université Louis Pasteur, Section Sciences, 12 rue de l'Université, F-67000 Strasbourg;(3) Present address: Department of Veterinary Anatomy, University of Missouri, 65201 Columbia, Missouri, USA;(4) Present address: Station de Physiologie de la Reproduction, I.N.R.A., F-37380 Nouzilly, France |