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.

CDK9 T439-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.

CDK7 T439-p
CDK9 T439-p
Regulatory protein:
OGT S448-p
PRP4 S499-p , S501-p
EGF S445-p
ischemia T439-p , S473-p
LRRK2-IN-1 S448-p
metastatic potential S448-p , S499-p , S501-p
nocodazole S445-p , S448-p
quinalizarin S499-p