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Cluster analysis and heat map of serum metabolite ion signal intensities from conventional and germ-free rats fed BD or RS for 28 days, using metabolites that show the top 15% of variation across all samples. The color bar across the top of the heat map indicates the treatment group of the rat: CR-BD (blue), CR-RS (red), GF-BD (black), and GF-RS (green). The right vertical axis indicates metabolite ion identifications (mass/retention time).
