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Evaluation of the effects of antibiotics on stool biomarkers (A) miR-221 and (B) miR-18a. Patients who took antibiotics within 30 days of specimen collection (n=26) were compared with patients without any antibiotic intake (n=162). miRNA levels were expressed in number of copies per nanogram of extracted RNA. Open circles represent samples with an undetectable miRNA level. The lines denote the medians.
