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.

ERK2 S335-p , S339-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 S335-p , S339-p
Regulatory protein:
MPRIP S200-p , T420-p , S543-p , S545-p
insulin S246-p , S339-p
LPS T420-p
LY294002 S339-p
MK-2206 S246-p
PTH(1-34) S543-p