. "Region 1.1 modulates DNA binding by region 2 and 4 when sigma isunbound by the core RNA polymerase [1,2]. Region 1.1 is also involved in promoter binding [1] " . "Sigma70_r1_1" . "Sigma-70 factor, region 1.1" . "Finn RD" . "Family" . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .