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Nitrogen cell quota (a,b) of Anabaena variabilis and the residual nitrate (c) and ammonium (d) concentrations in the medium over 14 d of incubation under various nitrate (a,c) and ammonium (b,d) treatments. N-free treatment was set as the control. Measurements on day 0 were made 3 h after inoculation. All values were averaged from the triplicate samples and the error bars represent the standard deviation among replicates.
