Fig. 4From: Orally administered gold nanoparticles protect against colitis by attenuating Toll-like receptor 4- and reactive oxygen/nitrogen species-mediated inflammatory responses but could induce gut dysbiosis in miceThe effects of orally administered AuNPs on global gut microbiota structures: a the α-diversity metric ACE; b the unweighted UniFrac metric; c PCA analysis of β-diversity based upon the unweighted UniFrac distances, where each point represents a single sample with the percentages indicating the contribution of principal components to the difference of samples; d the ratios of Firmicutes to Bacteroidetes. The comparison is made by Wilcox’s test, and significant P-value is marked as *P < 0.05Back to article page