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Time course of GS inactivation after the addition of MSX and azaserine to Prochlorococcus strain PCC 9511 cultures. Symbols: ▪, control (no addition); ●, addition of 1 mM MSX; ▴, addition of 100 μM azaserine. Inhibitors were added at time zero. GS activity at time zero was 3.27 U · mg of chlorophyll−1.
