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Growth of P. aeruginosa (A) and P. fluorescens (B) SigX mutants (circles) and parent wild-type (squares) and OprF-deficient strains (triangles) in LB medium. Solid symbols denote cultures grown in high-salt (200 mM) media, and open symbols are used for cultures grown in low-salt (8 mM) media. OD600, optical density at 600 nm.
