FIG. 2.

Lysozyme sensitivity of M600 (sigE⁺) (A) compared to that of J2130 (ΔsigE) (B). Spores of each strain were plated on Difco nutrient agar to give confluent lawns and then a twofold dilution series of egg white lysozyme (from 1 mg ml⁻¹, as indicated) was spotted onto the plates immediately after plating. Zones of clearing, seen here as dark circles, were photographed after 2 days of incubation at 30°C.