TABLE 1.

Strains^a

Strain	Genotype	Source
LT2	Wild type	Laboratory strain
TT16365	strB1143::MudJb (iscR1::MudJ throughout)	J. Roth
TT16366	strB1144::MudJ (iscA2::MudJ throughout)	J. Roth
TT20152	fur-1 iroA1::MudJ zbj-5123::Tn10 (33% linked to fur-1)	J. Roth
TT20268	entB::MudJ	J. Roth
DM2361	sdhC203::Tn10dc(Tc)	Laboratory strain
DM5419	iscR1::MudJ
DM5420	iscA2::MudJ
DM5632	zbj-5123::Tn10 (Tc) fur-1
DM5633	zbj-5123::Tn10 (Tc) fur+
DM5634	iscR1::MudJ zbj-5123::Tn10 (Tc) fur-1
DM5635	iscR1::MudJ zbj-5123::Tn10 (Tc) fur+
DM5636	iscA2::MudJ zbj-5123::Tn10 (Tc) fur-1
DM5637	iscA2::MudJ zbj-5123::Tn10 (Tc) fur+
DM5694	iscR1::MudJ(pSU19)
DM5695	iscR1::MudJ(piscS1)
DM5708	iscR1::MudJ(piscR1)
DM5696	iscA2::MudJ(pSU19)
DM5710	iscA2::MudJ(piscA1)
DM5697	iscA2::MudJ(piscS1)
DM5719	iscA2::MudJ(pfdx1)
DM5720	iscA2::MudJ(pfdx1, pT76)
DM5721	iscA2::MudJ(pfdx1, piscA3)

^aUnless otherwise indicated, strains were constructed for this study. 

^bMudJ is used throughout the test to refer to the MudI1734 transposon (6a). 

^cTn10d refers to the transposition-defective mini-Tn10 (Tn10Δ-16 Δ-17) (53a).