Search results Search for: Search Refine your results by duration: Any Under 5 mins Under 20 mins Over 20 mins Sort by: Relevance Views Date Cell cycle intervention beyond Palbociclib; discovery of a CDK2/4/6 inhibitor Stephen Dann, PhD, Associate Research Fellow, Pfizer Phosphorylation of the retinoblastoma protein (RB1) by cyclin-dependent kinases (CDK) 4 and 6 is a critical checkpoint for G1/S cell cycle progression... 2 years ago | 51 mins