TABLE 1.

Bacterial strains used in this study^a

Strain	Genotype	Source or reference
JE7088	ΔmetE2702 ara-9	J. C. Escalante-Semerena strain collection
Derivatives of JE7088
JE11685	pBAD24b	J. C. Escalante-Semerena strain collection
JE12941	ΔcobD1371	J. C. Escalante-Semerena strain collection
JE14935	ΔcobD1371/pBAD24	J. C. Escalante-Semerena strain collection
JE20971	ΔcobD1371/pBAD24+SMUL_1544	This study

^aAll strains used in this study were derivatives of Salmonella enterica serovar Typhimurium strain LT2.

^bFrom reference 21.