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GFP expression in PCC6803. Synechocystis sp. PCC 6803 cells were grown in the CB medium for 12 days. Wild-type cells (a), or cells harboring pGFP500 (b) or pGFP461c (c), were subjected to microscopic observation. Fluorescence of GFP was also observed in the wild-type cells (d), or cells harboring pGFP500 (e) or pGFP461c (f). The exposure time of all samples was 0.7 s
