Growth curves for B. bronchiseptica strain RB53, a Bvg+ phase-locked mutant. Optical densities (OD600), DNA concentrations (geq/ml), and CFU counts (CFU/ml) during growth of RB53 are plotted along the y axis, and time, given in hours, is plotted along the x axis. All data points represent averages obtained from triplicate cultures, and error bars represent standard deviations.