Fig. S5.

T6S-mediated antagonism is impacted by the presence of other commensals. (A and B) A B. fragilis^N tssC strain lacking both E/I pairs (Bf n.i.) was introduced into germ-free mice in the presence of wild-type B. fragilis^N (Bf WT) (A) or B. fragilis^N tssC (Bf tssC) (B), along with a 14-species community of human gut commensals. Input (day 0) ratios are based on cfu counts from glycerol stocks of individual species quantified at the time of gavage. Abundance of each community member from day 1 to day 8 was measured from fecal samples using species- or strain-specific qPCR (Dataset S1, Table S5) (n = 5 mice per group).