mucin - a nitrogenous substance found in mucous secretions; a lubricant that protects body surfaces

compound protein, conjugated protein - a protein complex combining amino acids with other substances

erythropoietin - a glycoprotein secreted by the kidneys that stimulates the production of red blood cells

lectin - any of several plant glycoproteins that act like specific antibodies but are not antibodies in that they are not evoked by an antigenic stimulus

mucoid - any of several glycoproteins similar to mucin