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“ Casein phosphorylation was significantly inhibited by a high concentration of Mn2+ (greater than 25 mM) or KCl (greater than 100 mM) or by a small amount of heparin (greater than 10 units/mL) and was enhanced about 2-fold by protamine.”
The Journal of biological chemistry • 1982 | View Paper
“These kinases differ as follows: (a) the molecular weight of casein … kinase 2 (0.90mg/ml and 1.7mm respectively); (c) KCl … casein by casein kinase 1, whereas it inhibits phosvitin phosphorylation by this enzyme; on … kinase 1 is about 4-fold greater than that by casein kinase 2.”