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Microbial functional gene composition and NMDS analysis of functional pathways in high schools in Shanxi, China. A The relative abundance of first-level KEGG functional pathways. Schools 1–5 are from rural areas, and schools 6–10 are from urban areas. B NMDS ordination of classroom functional genes was calculated based on the Bray-Curtis distance matrix. Ordination plot between NMDS1 and NMDS2 is shown
