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Log cell numbers per ml and nitrate concentrations in DOC addition experiments. (A,C,E) are co-cultures containing the WT A. macleodii strain, and (B,D,F) contain the A. macleodii ΔnasA strain. Colors represent the day of the experiment on which DOC was added: black = control, no DOC added, gray = day of inoculation (T0), green = day 2, purple = day 4, blue = day 6, red = day 8.
