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Relative abundance of the 25 most abundant OTUs detected in smokers with or without COPD.
Notes: The top 25 most abundant OTUs were ranked in descending order of the mean relative abundance of the controls. The seven significant OTUs (raw P<0.05 and FDR <0.2, Mann–Whitney U-test) are indicated.
Abbreviations: FDR, false discovery rate; OTUs, operational taxonomic units.
