in the majority of red cell membrane preparations the 32p-labelling of proteins and polyphosphoinositides seemed to be stimulated by the catalytic subunit of the endogenous protein kinase , since the phosphorylation was not increased by the addition of the catalytic subunit but it was decreased by the heat-stable inhibitor protein of the protein kinase .
C0033640
protein kinase
C0031715
phosphorylation