showed a trendp = 0.0518
While no significant changes were observed in other enzymatic activities, β - N -acetylglucosaminidase, which hydrolyzes the β -1,4 or β -1,3 bonds between N -acetylglucosamine residues in host glycans and glycosaminoglycans, showed a trend of lower activity in the prebiotic group at month 6 ( p = 0.0518, Figure 4B , Table S12).