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Aerobic respiratory and anaerobic global regulatory mutants exhibited colonization defects in competitive colonization assays. E. coli EDL933 ΔarcA was eliminated during competition with wild-type E. coli EDL933 (A) but was able to colonize when fed alone (B). E. coli EDL933 Δfnr was eliminated during competition with wild-type E. coli EDL933 (C) but was able to colonize when fed alone (D).
