Kappa-casein; Kappa-casein stabilizes micelle formation, preventing casein precipitation in milk.

Beta-casein; Important role in determination of the surface properties of the casein micelles.

Alpha-lactalbumin A; Regulatory subunit of lactose synthase, changes the substrate specificity of galactosyltransferase in the mammary gland making glucose a good acceptor substrate for this enzyme. This enables LS to synthesize lactose, the major carbohydrate component of milk. In other tissues, galactosyltransferase transfers galactose onto the N- acetylglucosamine of the oligosaccharide chains in glycoproteins; Belongs to the glycosyl hydrolase 22 family.

Beta-lactoglobulin-1; Lactoglobulin is the primary component of whey, it binds retinol and is probably involved in the transport of that molecule.

Mitochondrial fission regulator 1.

Somatotropin; Plays an important role in growth control. Its major role in stimulating body growth is to stimulate the liver and other tissues to secrete IGF-1. It stimulates both the differentiation and proliferation of myoblasts. It also stimulates amino acid uptake and protein synthesis in muscle and other tissues; Belongs to the somatotropin/prolactin family.

Lactotransferrin; Transferrins are iron binding transport proteins which can bind two Fe(3+) ions in association with the binding of an anion, usually bicarbonate. The lactotransferrin transferrin-like domain 1 functions as a serine protease of the peptidase S60 family that cuts arginine rich regions. This function contributes to the antimicrobial activity. Shows a preferential cleavage at -Arg-Ser-Arg-Arg-|- and -Arg-Arg-Ser-Arg-|-, and of Z-Phe-Arg-|-aminomethylcoumarin sites.

Butyrophilin subfamily 1 member A1.

Peptidase A1 domain-containing protein; Belongs to the peptidase A1 family.