. "\"Any process that stops, prevents, or reduces the frequency, rate or extent of the glycosylation of one or more amino acid residues within a protein. Protein glycosylation is the addition of a carbohydrate or carbohydrate derivative unit to a protein amino acid, e.g. the addition of glycan chains to proteins.\" [GOC:dms, GOC:dph, GOC:pr]" . . "negative regulation of protein glycosylation" . "negative regulation of protein amino acid glycosylation" . . . . . . . . . . . . . .