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.

Regulatory protein:
KRas S14-p
desmopressin S14-p
fasting S14-p
glucagon S14-p
IL-33 S14-p
insulin S14-p
LPS S14-p
LY294002 S14-p
NKH_477 S14-p
PP1 S14-p
PTH(1-34) S14-p
racepinefrine S14-p