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Inhibition by cyanate of the nitrite uptake activity of NA3 and NA3S cells. Strain NA3 (A) and NA3S (B) cells grown with 60 mM nitrate were suspended in nitrogen-free medium to a Chl concentration of 10 μg ml−1. Nitrite (200 μM) and cyanate at the concentrations indicated were added to the cell suspensions at time zero. Changes in the nitrite concentration in the medium are shown.
