Definition of GlycoproteinGlycoprotein: A molecule that consists of a carbohydrate plus a protein. Glycoproteins play essential roles in the body. For instance, in the immune system almost all of the key molecules involved in the immune response are glycoproteins. A glycopeptide is similar in structure to a glycoprotein but has a shorter chain of amino acids. Last Editorial Review: 6/14/2012
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