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Inhibition of cyclin-dependent kinases (Cdks) may result in meiotic cell cycle arrest and apoptosis in rat eggs in vitro. We aimed to find out whether roscovitine, a Cdk inhibitor, inhibits extrusion of second polar body (II P and induced egg apoptosis in vitro. The metaphase-II (M-II) arrested eggs were collected from oviduct and exposed to various concentrations of roscovitine for 3h in vitro. The morphological changes, phosphorylation status of Cdk1, cyclin B1 level, hydrogen peroxide (H2O2), p53, Bax, Bcl2 and cytochrome c expressio