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Dissimilarity analysis of microbial OTUs, phyla, and families for all samples. “M” represents chamber 1 samples (with extra outdoor microbes) and “NM” represents chamber 2 samples (without extra microbes). (A) Cluster diagram at OTU level. (B,C) The Principal Coordinate Analysis (PCoA) is based on the Bray-Curtis distance for microbial phylum and family, respectively. Different colors represent different habitats, while different shapes indicate each chamber.
