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.

CDK1 S4-p
 Putative in vivo kinases: 

An enzyme-substrate reaction that occurs within living cells; includes cultured cells, ex vivo samples, and intact organisms. In the case of kinases, the large number of protein kinases in intact cells makes exact identification of the responsible kinase challenging.

CDK1 S4-p
Regulatory protein:
PRKD1 S816-p , S820-p
angiotensin_2 S816-p , S820-p
dasatinib S46-p
ephrin_B1 Y55-p
ephrin_B2 Y55-p
ischemia S13-p
lapatinib S46-p
metastatic potential S835-p
MG132 K635-ub
MLN8054 S21-p , S24-p
nocodazole S13-p , S835-p
UV T682-p
vemurafenib S816-p
vorinostat K593-ub