Subjects collected faecal samples at home 1 day before and 1 day and 7 days after the endotoxaemia experiment. These samples were stored at −20°C and transported to the study centre for storage at −80°C. Bacterial DNA was extracted using a bead‐beating protocol, and the extracted DNA was used for 16s rRNA gene sequencing (Illumina MiSeq sequencing) as described previously. 29 Data were processed using the NG‐Tax software package. 30
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