Fig. 6From: Construction of a sensitive and specific lead biosensor using a genetically engineered bacterial system with a luciferase gene reporter controlled by pbr and cadA promotersExpression of luciferase gene in different concentrations of lead. Luciferase gene expression controlled by cad promoter and cadR regulatory gene in the presence of different lead concentrations. Low levels of lead concentrations in about 10Â nM cause significant expression of the reporter geneBack to article page