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 S181-p
antibody S57-p
cyproterone_acetate S181-p
dasatinib S57-p
drospirenone S181-p
dydrogesterone S181-p
EGF S181-p
LRRK2-IN-1 S57-p , S181-p
medroxyprogesterone S181-p
metastatic potential S57-p , S181-p
NET-A S181-p
nomegestrel S181-p
norethisterone S181-p
PI-103 S57-p , S181-p
progesterone S181-p
quinalizarin S181-p