FIG. 2.

Biofilm formation and quantification of the comC, comD, and comE mutants on polystyrene surfaces. Mutants from three independent cultures were stained with safranin, and their OD₄₉₀s were measured. (A) Mean OD₄₉₀ values ± standard deviations; (B) photograph of typical biofilms grown on polystyrene microtiter plates. wt, wild type.