Fig. 2From: Construction of a sensitive and specific lead biosensor using a genetically engineered bacterial system with a luciferase gene reporter controlled by pbr and cadA promotersa The proliferation region of the pbr promoter with 634Â bp. b cadA promoter with 601Â bp. The promoter sequence and regulatory gene were amplified with 634Â bp for pbr and 601Â bp for cadA. 1Â kb DNA Ladder (Containing 14 linear double-stranded DNA fragments)Back to article page