any anomaly in the series of biochemical and morphological events that converts a metaphase-II-arrested oocyte into a fertilized egg ready to begin embryogenesis; in most mammals, oocyte activation is a spatial-temporal regulated process induced by sperm entry that involves early events such a transient rise in intracellular calcium concentration, cortical granule exocytosis and meiotic cell-cycle resumption, and later events such as pronuclear formation, translation of maternal mRNAs and meiosis-to-mitosis transition
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