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Derivatives with insertional inactivation of prqA and mvrAgenes were obtained and studied in the Synechocystis sp. PCC 6803 wild-type strain and in the mutant Prq20 resistant to methyl viologen (MV). It was shown that the formation of resistance to MV is associated with the operation of two systems: constitutive and inducible. TheprqAgene encoding drug efflux protein controls the constitutive system...