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. Author manuscript; available in PMC: 2012 Nov 1.
Published in final edited form as: Semin Cancer Biol. 2011 Sep 18;21(5):335–346. doi: 10.1016/j.semcancer.2011.09.008

Fig. 4.

Fig. 4

Targeting the cell cycle. The Cyclin D1-CDK4/6 complex phosphorylates Rb and promotes G1/S phase transition of the cell cycle. Endogenous proteins p15/16 suppress this complex as do the pharmacologic inhibitors shown in blue boxes. Pan-CDK inhibitors regulate transcription through CDK7, 9 and 10 in addition to cell cycle inhibition.