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.

P38A S261-p
Regulatory protein:
ADCY6 S256-p , S269-p
8-CPT-2Me-cAMP S269-p
dDAVP S269-p
ddFSK S269-p
desmopressin S256-p , S261-p , S269-p
EGF S256-p
erlotinib S256-p , S261-p , S269-p
methyl-beta-cyclodextrin S269-p
NH4Cl S256-p , S261-p
NPS_2143 S261-p
oxytocin S269-p
SB203580 S261-p
vasopressin S256-p , S269-p