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. 2014 May 9;122(8):817–822. doi: 10.1289/ehp.1307759

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Interindividual variability of sulfate-reducing activity (H₂S production; A) and thiolation (MMMTAV formation; B) in different human fecal samples (from individuals A, B, C, G, H, I, and J) during 48 hr of incubation with MMA^V. Abiotic controls are represented by the heat sterilized incubation of fecal microbiota from individual A. **p < 0.01, by one-way ANOVA and two-case t-test compared with the other groups.