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Discriminant peaks detected in extracts and also present (brown) or absent (blue) in culture medium, with their putative identity.
Significant differences in peak areas between strains are highlighted and p values obtained after ANOVA and post-hoc Tuckey’s HSD (or Kruskal–Wallis for non-parametric data‡) are shown for UV data (***p < 0.0001; **p < 0.001; *p < 0.05).
