FIG. 3.
Analysis of cyanophycin accumulation (A) and NAGK activity (B) in cell extracts from Synechocystis sp. strain PCC 6803 cells, which had been grown under nitrate-limiting conditions and shifted to 5 mM ammonium chloride with 5 mM arginine. Immediately before the shift (time zero) and after different time points, as indicated, aliquots were removed and extracts were prepared. The results from the Synechocystis wild-type strain are shown by the black bars and those from the ΔPII strain by open bars.