Kinase, in vitro: 

An enzyme-substrate reaction that occurs in non-living experimental conditions such as a test tube. For example, a purified enzyme is reacted with a substrate protein or mixture of proteins or peptides.

CDK2 S309-p
CDK3 S309-p
 Putative in vivo kinases: 

An enzyme-substrate reaction that occurs within living cells; includes cultured cells, ex vivo samples, and intact organisms. In the case of kinases, the large number of protein kinases in intact cells makes exact identification of the responsible kinase challenging.

CDK2 T258-p , S289-p , S291-p , S309-p
CDK3 S309-p
Regulatory protein:
CCNC S309-p
p21Cip1 S309-p
p27Kip1 S309-p
PIN1 S291-p , S309-p
EGF S291-p , S309-p
serum_starvation S309-p
U0126 S291-p , S309-p