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Catalase (a) and SOD (b) activities in A. baumannii isolates (C1 to C4, M2 [clinical isolates], ATCC 19606, ATCC 17978, and the abaI::Km quorum-sensing mutant of M2) grown in the absence (□) and presence (■) of pyocyanin. Data are means from three experiments. *, P ≤ 0.05; **, P ≤ 0.01.
