Membrane differentiation in the pregastrula of the teleost, Brachydanio rerio Hamilton-Buchanan (Teleostei : Cyprinidae). A scanning electron microscope study P. ROUBAUD, Catherine PAIRAULT, A. NEUVIC, J. Y. SIRE, F. ALLIZARD and F. MEURYReprod. Nutr. Dévelop., 20 5A (1980) 1515-1526DOI: https://doi.org/10.1051/rnd:19800810