urinary samples were fractionated by means of gel filtration and anion exchange chromatography to yield ( i ) fraction i consisting of basic , neutral , or slightly acidic glycopeptides and/or oligosaccharides , ( ii ) fraction ii consisting of acidic glycopeptides and/or oligosaccharides , and ( iii ) fraction iii consisting of glycosaminoglycans ( acidic mucopolysaccharides ) .
C0003075
anion
C0021966
i