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Beta diversity of gut microbiota in young and old groups. (A) PCoA based on unweighted UniFrac distances. (B) PCoA based on weighted UniFrac distances. (C) NMDS analyses based on Bray-Curtis distance values (Adonis: R 2 = 0.163, P = 0.005). (D) Anosim based on Bray-Curtis distance (R = 0.3473, P = 0.008).
