FIG. 3.

myc-lacZ expression in B. subtilis. (A) Expression levels of myc-lacZ in strain ATCC 6633, grown in rich medium (□), minimal medium (○), and sporulation medium (▵). (B) Effects of various mutations on the expression of myc-lacZ in B. subtilis ATCC 6633. The following cultures were grown in rich medium: ▪, wild type; •, ΔabrB mutant; and ▴, Δspo0H mutant. (C) Expression profiles of a myc-lacZ reporter fusion in B. subtilis 168-8G5, grown in rich medium (□), minimal medium (○), and sporulation medium (▵). The time scales refer to hours before and after the transition from exponential to stationary-phase growth (defined as time zero). β-Galactosidase activities are presented in activity units per OD₆₀₀ unit.