the exoglucanases ( especially cellobiohydrolases , which split off cellobiose units from the nonreducing end of the cellulose chain ) specifically act on the agluconic bond ( between p-nitrophenyl and the disaccharide moiety ) and not on the holosidic bond ( between the two glucose units of cellobiose ) .
C0007648
cellulose
C0007630
cellobiose