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.

ERK1 S213-p , S257-p
P38A S22-p , S257-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.

ERK1 S213-p , S257-p
Regulatory protein:
HRas S257-p
MKK6 S257-p
Treatment:
anti-CD3 T18-p , S22-p
EGF S257-p
HMBA S257-p
hypertonic_buffer K99-sm , S257-p
ischemia S271-p , S284-p
nocodazole S213-p