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 S294-p
ERK2 S294-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 S294-p
ERK2 S294-p
faslodex S294-p
GnRH S294-p
H-89 S294-p
heregulin S294-p
PD90059 S294-p
PD98059 S294-p
progesterone S294-p
progestin_R5020 S294-p