Alpha-S2-casein-like B; Important role in the capacity of milk to transport calcium phosphate.

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

Alpha-lactalbumin; 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.

Alpha-S2-casein-like A; Important role in the capacity of milk to transport calcium phosphate.

Whey acidic protein; Could be a protease inhibitor. May play an important role in mammary gland development and tissue remodeling.

Glycosylation-dependent cell adhesion molecule 1; Adhesion molecule that accomplishes cell binding by presenting carbohydrate(s) to the lectin domain of L-selectin; Belongs to the PP3/GlyCAM-1 family.

Butyrophilin subfamily 1 member A1; May function in the secretion of milk-fat droplets. May act as a specific membrane-associated receptor for the association of cytoplasmic droplets with the apical plasma membrane (By similarity). Inhibits the proliferation of CD4 and CD8 T-cells activated by anti-CD3 antibodies, T-cell metabolism and IL2 and IFNG secretion; Belongs to the immunoglobulin superfamily. BTN/MOG family.

Gene model 131, (NCBI); Belongs to the peptidase A1 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.