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The rate of photosynthetic O2 evolution as a function of added Ci for bicA and sbtA knockout mutants of Synechococcus PCC7002 assayed at pH 9.3. Cells were grown at 2% CO2 and transferred to CO2-free air for 5 h. Typical responses are shown. The response of WT cells grown at 2% CO2 is shown as a dashed line (no symbol).
