Fig. 2From: The effect of in vitro simulated colonic pH gradients on microbial activity and metabolite production using common prebiotics as substratesSummarized species-level gut microbiota composition of individual fermentation samples with different substrates. D, donor; L, low pH from 5.2-6.4; M, medium pH from 5.6-6.8; H, high pH from 6.0-7.2Back to article page