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.

CDK7 S203-p
ERK1 S203-p
ERK1 S203-p
ERK2 S203-p
ERK2 S203-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.

ERK2 S203-p
Regulatory protein:
DUSP1 S203-p
DUSP1 S203-p
GEMIN3 K119-sm , K194-sm
PIAS1 K119-sm , K194-sm
PIAS3 K119-sm , K194-sm
RAF1 S203-p
STF-1 S203-p
ACTH K194-sm
EGF S203-p
GF109203X S203-p
PACAP S203-p
seliciclib S203-p
U0126 S203-p