one of the building blocks of the cell membrane. it prevents rejection from the organism by enabling the cell to gain identity.
there are acyaloglycoprotein receptors for circulating glycoprotein molecules.
when glycoproteins lose their sialic acid in their structure, they are taken from the circulation by the acyaloglycoprotein receptors in the liver and are broken down by proteases called cathepsins in the lysosomes.
it has duties such as ensuring that cells adhere to each other, controlling the exchange of substances between cells, ensuring that cells respond to hormones, and providing antigen properties of blood groups.