Beta-lactoglobulin
（重定向自Lactoglobulin）
![Structure of a β-lactoglobulin subunit (PDB entry 3BLG) Ribbons denote the secondary structure, with arrows for beta strands and spirals for alpha-helices. Rendered with Kinemage](/Images/godic/202501/23/3blg5859.png")
β-Lactoglobulin is the major whey protein of cow and sheep's milk (~3 g/l), and is also present in many other mammalian species; a notable exception being humans. Its structure, properties and biological role have been reviewed many times.