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.

ROCK1 T19-p , S20-p
Regulatory protein:
P38A T19-p , S20-p
Clostridium_toxin_B T19-p , S20-p
exoenzyme_C3 T19-p , S20-p
phorbol_ester T19-p , S20-p
thrombin T19-p , S20-p