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Significant changes in the gut microbes of elderly women. (A) Comparison of the Chao1 index and the Shannon index in maternal gut microbiota for different age groups. (B) PCoA for different age groups. (C) The top 5 most abundant phyla in maternal gut microbiota. (D) Bacteria with statistically significant differences between different age groups at the genus level. *, P < 0.05.
