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Common and unique OTUs of four groups in the Venn diagram. The OTUs were assigned to taxa using the silva138 (16s bacteria database). N_FAE: original fecal samples of healthy volunteers, n = 5; U_FAE: original fecal samples of UC patients, n = 5; U_Y: fecal fermentation samples in YCFA of UC patients, n = 5; U_XOS: fecal fermentation samples in YCFA+XOS of UC patients, n = 5.
