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In vivo T6S antagonism is strain-dependent. Recipient strains B. fragilisTB9 (A) or B. fragilisDS (B) were introduced into germ-free mice with either B. fragilisN WT or tssC mutant strains. Dotted lines indicate abundance of recipient strains on day 0 based on cfu counts. Strain abundances were determined by qPCR from fecal gDNA on day 14 post-gavage. *P < 0.05 between day 0 and day 14 time points; n.s., not significant (n = 3 mice per group); error bars indicate ± SD.
