Figure 3
From: Viral promoters can initiate expression of toxin genes introduced into Escherichia coli
Expression of hemolysin genes in E. coli directed by viral promoters. Hemolysis of sheep blood erythrocytes by E. coli DH5α containing the vlly coding sequence without promoter (panels A and D), with the promoter from the polyhedrin gene (P PH: panels B and D) or with the immediate early promoter from CMV (P CMV: panels C and D). Panels A to C show the hemolysis in blood agar plates visible as cleared zones around the colonies. Panel D indicates the percentage of erythrocytes lysed in a liquid blood assay. The columns show the average of two measurements.