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NO‐N (ng l−1) production by the human intestinal microbiota incubated for 24 h in feed medium without cysteine (control), supplemented with cysteine (4 or 20 mmol l−1), formate (4 or 20 mmol l−1) or H2 gas (2 % or 10 % in headspace). The mean ± SD is shown. The asterisk indicates significant differences compared to the feed without cysteine (P < 0.05).
