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Overview of the unconstrained (Unsupervised) ordination analysis of the participants who had undergone 16S rRNA testing for gut microbiota. (A) Principal component analysis (PCA) of clinical variables (1087 samples). (B) Principal coordinate analysis based on Bray-Curtis distance shows beta-diversity (similarity between 1177 samples) among the four groups. (C) PCA of dietary metadata (1045 samples). MR, mountain rural; MU, mountain urban; PR, plain rural; PU, plain urban.
