The most abundant genera of gut microbiota indifferentage groupsA. Heatmap showing the most abundant genera in the gut microbiota of the four age groups. B. Box plots showing the ranking of top 20 abundant genera in each of the four age groups. The ten genera shared by all four age groups are labeled in red. C. Venn plot illustrating the overlap of top 20 abundant genera among different age groups. The prefix before each genus name indicates the phylum which the genus belongs to. B, Bacteroidetes; F, Firmicutes; E, Epsilonbacteraeota; P, Proteobacteria; S, Spirochaetes.