» See Casein paint for information about casein usage in artistic painting. Casein (from Latin caseus "cheese")'s the predominant phosphoprotein (αS1, αS2, β, κ) that accounts for nearly 80% of proteins in cow milk and cheese. Milk-clotting proteases act on the soluble portion of the caseins, K-Casein, thus originating an unstable micellar state that results in clot formation. When coagulated with renin, casein's sometimes called paracasein. Chymosin (EC 3.4.23.4)'s an aspar… (More on Casein)