The major sialoglycoprotein of the human erythrocyte membrane. It consists of at least two sialoglycopeptides and is composed of 60% carbohydrate including sialic acid and 40% protein. It is involved in a number of different biological activities including the binding of mn blood groups, influenza viruses, kidney bean phytohaemagglutinin, and wheat germ agglutinin.

(12 Dec 1998)