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.

CK2A1 S151-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.

MSK1 S354-p
p90RSK S354-p
RSK2 S354-p
ACTH S354-p
anisomycin S354-p
cAMP_analog S354-p
EGF S354-p
H-89 S354-p
IGF-1 S354-p
NGF S142-p , S354-p
okadaic_acid S354-p
PD184352 S354-p
phorbol_ester S354-p
Ro31-8220 S354-p
SB203580 S354-p
silmitasertib S151-p
siRNA S151-p , K539-ub
TBB S151-p
TNF K539-ub
U0126 S354-p
wortmannin S354-p