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 S446-p
Treatment:
EGF S446-p
H2O2 S446-p
ionomycin S446-p
ischemia S501-p
phorbol_ester S446-p
serum S446-p
U0126 S446-p