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

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As speciation of MMA^V into MMMTA^V and As^III in the ascending (A), transverse (B), and descending (C) colon of the dynamic gut model SHIME. As speciation (i.e., thiolation of MMA^V into MMMTA^V or demethylation of MMA^V into As^III), was measured daily during 4 days (the 24, 25, 26, 27th days) at two time points: 10 and 16 hr. The horizontal arrows indicate the sequence of colon compartments of the SHIME. The vertical arrow in (A) indicates the addition of the SRB inhibitor sodium molybdate.