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Cobalamin supplementation alters the Firmicutes and Proteobacteria populations within the GI tract of C3H/HeOuJ mice Cyanocobalamin supplementation at 40 g/ml in drinking water caused a shift in microbial composition in the cecum and colon, but not ileum, favoring Proteobacteria species and altering the dynamics of the low-abundance Firmicutes (Figs