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Effects of four B. longum strains (CCFM 1077, I3, J3, B3) on the overall structure of fecal microbiota. Alpha diversity was represented by (A) Chao 1 index and (B) Shannon index. Beta diversity was represented by (C) PCoA, based on weighted UniFrac distances. *** represents p < 0.001, ** represents p < 0.01, * represents p < 0.05, n.s represent non-significant with p > 0.05.
