haemophilus influenzae type b ( hib ) capsular polysaccharide ( prp ) was selectively hydrolyzed to reducing oligosaccharides , and the fraction containing 3-10 ribosylribitolphosphate repeating units ( vs ) was conjugated by reductive amination to diphtheria toxin ( dtx ) , its nontoxic derivative crm197 ( dcr ) , or diphtheria toxoid ( dtd ) .
C0032594
polysaccharide
C0028959
oligosaccharides