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Growth phenotypes of the four crp/fnr knockout mutants. (A) no stress; (B) air shock; (C) 300 mM NaCl; (D) 0.5 mM nitrite; (E) 0.7 mM chromate (VI); (F) growth phenotype of complemented mutants with extra 300 mM NaCl in the medium. The standard deviations of the results from four biological replicate experiments are shown as error bars. The arrows in panel B indicate the addition of air (10 ml).
