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Unweighted (A) and weighted (B) analyses of similarities and principal coordinate analysis based on the distance matrix of UniFrac dissimilarity of the fecal microbial communities in the NCI and non-NCI groups. NCI group, HIV-infected persons with neurocognitive impairment; non-NCI, HIV-infected persons without neurocognitive impairment; PC, principal components. Each symbol represents a sample.
