xanthoproteic hopkins cole biuret chaperones protein folding quaternary structure tertiary structure secondary structure primary structure globulins albumins polypeptide peptide protein amylopectin amylose lactose sucrose maltose chitin cellulose starch storage polysaccharides polysaccharides reducing sugars oligosaccharides disaccharides monosaccharides carbohydrates biochemistry basic amino acids acidic amino acids polar glycine amino acids antibodies mucins glycoproteins n-linked
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