REVIEW Purvalanol B is a cyclin-dependent kinase inhibitor with IC50 values of 6, 6, 9, > 10,000, and 6 nM for cdc2/cyclin B, cdk2/cyclin A, cdk2/cyclin E, cdk4/cyclin D1 and cdk5-p35 respectively. Purvalanol B has also been shown to have anti-proliferative properties, mediated by p42/p44 MAPK.
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