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 S290-p
PKCA S285-p , S290-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.

P38A S285-p , S290-p
Putative upstream phosphatases:
PPP2CA S285-p
brefeldin_A S290-p
calyculin_A S285-p
GF109203X S290-p
Go_6976 S285-p , S290-p
Go_6983 S285-p , S290-p
hispidin S285-p , S290-p
methyl-beta-cyclodextrin S290-p
palmitate S290-p
PAR2-activating_peptide S285-p , S290-p
peptide_agonist S285-p , S290-p
phorbol_ester S290-p
rottlerin S290-p
safingol S285-p , S290-p
SB202190 S290-p
thrombin S285-p , S290-p