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At fertilization periodic Ca 2+ oscillations release oocytes from meiotic arrest. The present study examined whether these oscillations have a long-term role in pre- and postimplantation development, independent of their immediate effect. Sr 2+ -containing medium was used to induce oscillations during exit from meiosis and first embryonic mitosis and Sr 2+ -activated parthenotes...
Ca 2+ release mechanisms in oocytes are highly sensitive and a number of agents including sperm and inositol trisphosphate (IP 3 ) generate Ca 2+ transients. Recently it was shown that this sensitivity decreases after fertilization and subsequent entry into the first mitotic cell cycle (Joneset al., Development121, 3259-3266, 1995). In this study a similar decrease...