IndraLab
Statements
"The pRb phosphorylated in vitro by Cdk4 was inactive as a growth suppressor upon microinjection, but pRb phosphorylated by Cdk2 or Cdk3 retained cell cycle arrest activity. While these kinases efficiently phosphorylate a common set of residues, including S373 and S788, cyclin D1/Cdk4 was a much more efficient kinase for S795 than the other kinases examined."