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In vitroH2O2production by variousL. johnsoniistrains. (A-C) H2O2 production by L. johnsonii strains WT, OE and DEL determined after 24 h of growth at 21% O2 (A), at 3% O2 (B) or anaerobic (C) in LAPTg medium at 370C. Catalase was added as control. All values are represented as mean ± SD and were analysed by one-way ANOVA. * **p ≤ 0.001. ns means non-significant.
