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 S159-p , S174-p , S197-p , S300-p
ERK2 S159-p , S197-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 S159-p , S197-p
Regulatory protein:
PDGFRA S174-p , S300-p
PDGFRB S174-p , S300-p
4-HT S159-p , S197-p
anisomycin S159-p , S197-p
cycloheximide S159-p , S197-p
EGF S328-p
metastatic potential S328-p , S331-p
PD184352 S159-p , S197-p
PDGF S174-p , S300-p
SB202190 S159-p , S197-p
selumetinib S351-p
serum S159-p , S197-p
U0126 S159-p , S174-p , S197-p , S300-p
vemurafenib S351-p