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V. BITTON-CASIMIRI, J. L. BRUN and A. PSYCHOYOS

Summary.

Rat blastocysts, flushed from the uterus at the moment of the initiation of the implantation process and observed in vitro by time-lapse cinematography, were seen to undergo a series of contractions and dilatations. By these movements, vesicles, containing granular material, emerged through the zona pellucida into the culture medium.

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V. Bitton-Casimiri, J. L. Brun and A. Psychoyos

Laboratoire de Physiologie de la Reproduction, CNRS, E.R. 122, Hôpital de Bicêtre (INSERM), 94270 Bicêtre, France