Germinal vesicle breakdown in the Xenopus laevis oocyte : description of a transient microtubular structure Denise HUCHON, Nicole CROZET, Nicole CANTENOT and R. OZONReprod. Nutr. Dévelop., 21 1 (1981) 135-148DOI: https://doi.org/10.1051/rnd:19810112