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Quantification of arginine in ethanolic extracts from Synechocystis sp. strain PCC 6803 cells which had been grown under nitrate-limiting conditions and shifted to 5 mM ammonium chloride at time zero. The concentration of arginine is given as pmol Arg extracted per unit of optical density at 750 nm (OD750) of cells. The results from the Synechocystis wild-type strain (black bars), the MPphA strain (gray bars), and the ΔPII strain (open bars) are shown.
