Binds water, Ca(2+), Na(+), K(+), fatty acids, hormones, bilirubin and drugs. Its main function is the regulation of the colloidal osmotic pressure of blood. Plasma. Can cause allergic reactions in humans. Binds to IgE. Partially heat-labile allergen that may cause both respiratory and food-allergy symptoms in patients with the bird-egg syndrome. Belongs to the ALB/AFP/VDB family.