FIG. 3.

Response of srfA-lacZ expression to conditioned medium in strains carrying wild-type and mutant comP. The open symbols indicate β-galactosidase activities for strains grown with conditioned medium obtained from a comX strain (BD2356). The solid symbols indicate β-galactosidase activities for strains grown with conditioned medium from a comX⁺ strain (IS75). The strains grown in these conditioned media carried the XbaI comP (●, ○; BD2747) or the ΔLc comP (■, □; BD2746) mutations. Time is given in hours before or after T₀.