FIG. 3.

Summary of mutational effects on developmental expression from the Ω4400 promoter. The promoter region from −86 to −8 bp is shown. The downward arrows indicate decreased developmental lacZ expression caused by the mutations shown, and the numbers indicate the relative amounts of β-galactosidase specific activity observed for the mutants, expressed as percentages of the wild-type promoter activity measured in the same experiment (Table 2). Mutations are alternatively underlined and enclosed in boxes.