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 S105-p
ERK2 S105-p
PKACA S261-p
RSK2 S261-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 S105-p
PKACA S261-p
Regulatory protein:
ERK1 S261-p
NHE1 S261-p
p90RSK S261-p
angiotensin S105-p
ANP S105-p
BI-D1870 S261-p
EMD_87580 S261-p
endothelin S105-p
H-89 S105-p , S261-p
IGF-1 S105-p
isoproterenol S105-p
LY294002 S105-p
PD90059 S261-p
phenylephrine S105-p , S261-p
SB203580 S105-p , S261-p
serum S105-p
SL0101 S261-p
U0126 S105-p
urofollitropin S105-p