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Gray matter volume (GMV) association with fecal microbial β-diversity. GMV regions include hippocampus, amygdala, nucleus accumbens and pericalcarine (control). Microbial β-diversity measured by robust Aitchison distance is visualized by principal coordinates analysis (PCoA) plots. Each symbol represents a sample with voxel-based GMV represented by the color gradient. p-values for microbial β-diversity association with GMV are calculated by Adonis adjusting for age and sex.
