TABLE 1 .

Strains used in this study

Strain	Relevant characteristic(s)	Reference or source
Newman	Wild type	40
hemA mutant	ΔhemA	This study
menB mutant	ΔmenB	28
hemB mutant	hemB::erm	This study
cydB mutant	cydB::erm	This study
qoxB mutant	ΔqoxB	This study
cydB qoxB mutant	cydB::erm ΔqoxB	This study