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Response of a freshly grown (ca. 1-week-old) enrichment culture to the addition of 8 mM Fe(II) (refeed) (A) or a combination of 0.5% yeast extract, 0.5% tryptic soy broth, and 0.5 mM acetate (add organics) (B). Data are presented as means ± SD for triplicate cultures. Symbols are as in Fig. 1.
