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.

ERK1 S276-p , S293-p , T300-p , S303-p , S462-p
ERK2 S276-p , S293-p , T300-p , S303-p , S462-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.

CDK1 S48-p , S276-p , S293-p , T300-p , S303-p , S424-p
CDK2 S276-p , S293-p , T300-p , S303-p
CDK6 S48-p , S276-p , S293-p , T300-p , S303-p , S424-p
Regulatory protein:
CBFB S276-p , S303-p
MYH11 S276-p , S303-p
Treatment:
alsterpaullone S276-p , S303-p
Cdk2_inhibitor_II S276-p , S303-p
cell cycle regulated S276-p , S303-p , S462-p
LY294002 S424-p
nocodazole S276-p , S303-p , S462-p
PD98059 S293-p , T300-p , S303-p , S462-p
phorbol_ester S276-p , S293-p , T300-p , S303-p , S462-p
PP2 S424-p
purvalanol S276-p , S303-p , S462-p
seliciclib S48-p , S276-p , S303-p , S424-p
U0126 S424-p