TABLE 1.

Growth of single and double mutants on MM with or without NA and 1 mM IPTG^a

Strain	Growth of strain on:
	MM	MM + NA	MM + IPTG	MM + NA + IPTG
PB1934 (ΩpncB::pMUTIN4)	+−	−	++	+
PB1935 (ΩpncB::pMUTIN4, ΔyrxA)	++	++	++	++
BFS2652 (ynaB::pMUTIN4)	++	+	ND	ND

^aThe same results were obtained using 50 or 0.5 μg/ml of NA. ++, colonies appear after 24 h at 37°C; +, colonies appear after 48 h at 37°C; +−, very small colonies appear after 48 h; ND, not determined.