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Relative abundances (a) and heat map (b) showing the predominant bacterial phyla of Firmicutes, Bacteroidetes and Actinobacteria during in vitro colonic fermentation of 3% cellulose (CEL), 3% cellulose + 0.16% PSP (CELP), 3% inulin (INU), and 3% inulin + 0.16% PSP (INUP).
