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Kinetics of Cdk1 activity in oocytes during in vitro culture. Cdk1 activity was calculated as a percentage of maximal activity (activity in ovulated oocytes was defined as 100%, and that in oocytes that were ethanol activated for 6 h was defined as 0%). The decrease in Cdk1 activity caused by the prolonged culture of ovulated oocytes was delayed by the addition of 4% DMSO to the culture medium
