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Accumulation of 7-epi-CYN and CYN in the culture medium of Oscillatoria PCC 6506. Oscillatoria PCC 6506 was cultivated in BG11 medium at 20°C under constant illumination, and aliquots of the culture medium were withdrawn at different time points. The concentrations of 7-epi-CYN (□) and CYN (•) excreted were then determined by LC-MS2 analysis. Each data point represents the average of data from two determinations. The experimental errors were less than 10%.
