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Oxygen evolution and consumption rates by Synechocystis sp. PCC 6803 wild-type (wt) and kpsM mutant strains. Photosynthetic activity was measured in the middle of the light period, and respiration was measured in the middle of the dark period (arrows) of the 12-h light/12-h dark growth regimen as described in Materials and Methods (*, P value of ≤0.05; **, P value of ≤0.01).
