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Expression of RFab1 protects otherwise susceptible strains from Fab1-mediated antagonism. Expression of the genetic cassette containing fab1 and rfab1, but not fab1 alone, in the susceptible BfR parental strain protects against Fab1-mediated antagonism. Input and output CFU of BfR target strains are reported. Error bars indicate SD (n = 2; representative of three independent experiments). **, P < 0.01; n.s., not significant.
