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.

RSK2 S663-p
Regulatory protein:
PIK3CA S555-p
angiotensin_2 S555-p
chelerythrine S555-p
colforsin S555-p
gastrin S555-p
Go_6976 S555-p
losartan S555-p
PTX S555-p
U73122 S555-p
wortmannin S555-p