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Assays of β-galactosidase activity and LacZ abundance showed the effect of spermidine on expression of PCASDC-lacZ in Synechocystis strains. (A) β-Galactosidase activity in Synechocystis 6803::PCASDC-lacZ (dark gray), Synechocystis 6803 DRHB2193::PCASDC-lacZ without (light gray), or with (open) exogenous spermidine. (B) Western blot detection of LacZ in Synechocystis 6803::PCASDC-lacZ (row I) and Synechocystis 6803 DRHB2193::PCASDC-lacZ (row II). DRHB2193, the CASDC mutant.
