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Growth (A) and Pi uptake (B) of Synechocystis sp. strain PCC6803 and phoU mutant SPU101. Strains PCC6803 (•) and SPU101 (○) were grown in BG-11 medium at 30°C under light (5,000 lx) with 1% CO2. OD750, optical density at 750 nm.