since it is known that pna binds to the terminal disaccharide , beta-galactose- ( 1-3 ) -n-acetylgalactosamine , which is localized at the reducing end of the oligosaccharide chains of mucus , it is highly probable that the elongation of the oligosaccharide side chains is disturbed in gastric cancer cells .
C0012611
disaccharide
C0028959
oligosaccharide