Caseins constitute 80% of the total milk proteins in the cow.
κ-Casein is one of the major allergens in cow milk.
It is a glycosylated protein comprising galactose, galactosamine, and sialic acid. It exists as tri- or tetrasaccharides and occurs in different isoforms based on the number of oligosaccharides attached to it. κ-Casein has a hydrophobic N-terminus and a hydrophilic C-terminus region.