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 S31-p , S42-p
Regulatory protein:
MKK6 S31-p , S42-p
Treatment:
SB203580 S31-p , S42-p
serum_withdrawal S31-p , S42-p