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Proline-rich inositol polyphosphate 5-phosphatase(PIPP)may inhibit AKT activity by hydrolyzing the 5-phosphate of phosphatidylinositol [PtdIns(3,4,5)3] to block the interaction of PtdIns(3,4,5)3 with protein kinase B(PKB/AKT).AKT activity has been reported to promote the mitosis of fertilized mouse eggs.This investigation aimed to study the effect of PIPP on meiotic resumption in mouse oocytes.