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β-Galactosidase activity in Miller units (triangles) and OD600 (circles) of K. pneumoniae strain MB1 during anaerobic growth in citrate minimal medium with either 4 mM glucose (B), 4 mM gluconate (C), or 10 mM glycerol (D) added at an OD600 of 0.1 (arrows). In a control culture (A), 4 mM citrate was added at an OD600 of 0.1 (arrow).
