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Expression of lacZ in Synechocystis 6803::PCASDC-lacZ under the chill-light stress with (B and D) or without (A and C) preconditioning. The expression of lacZ was determined as shown by the β-galactosidase activity (A and B) or qRT-PCR (C, D). Bars in panels A and B: dark gray, Synechocystis 6803::PCASDC-lacZ; light gray, Synechocystis 6803::PCASDC-lacZ supplemented with chloramphenicol upon transfer to 5°C; open, Synechocystis 6803 treated in parallel (background activity).
