Casein (/ˈkeɪsiːn/ KAY-seen, from Latin caseus "cheese") is a family of related phosphoproteins (αS1, aS2, β, κ) that are commonly found in mammalian milk, comprising about ...
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80% of the proteins in cow´s milk and between 20% and 60% of the proteins in human milk. Sheep and Cow milk have a higher casein content than other types of milk with human milk having a particularly low casein content.
Casein has a wide variety of uses, from being a major component of cheese, to use as a food additive. The most common form of casein is sodium caseinate. Casein is secreted into milk from mammary cells in the form of colloidal casein micelles, a type of biomolecular condensate.
