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Cyclin A-associated proteins and CDK activity. The NIH 3T3 derivatives were grown asynchronously (As) or synchronously as in Fig. 1, and the extracts from cells under nocodazole block (M), 120 min after the release (G1), and 16 h after the release (S) were immunoprecipitated (IP) with anti-myc antibodies and then immunoblotted (IB) for the indicated proteins or assayed for the histone H1 kinase activity.
