Sodium dodecyl sulfate-polyacrylamide electrophoresis pattern of FliI in whole-cell extracts from SJW2702, SWJ1102 (wild type Salmonella), and fliI complemented Salmonella strains induced with IPTG. 1st Lane, PageRuler™ Prestained protein ladder; 2nd Lane, without plasmid; 3rd Lane, with plasmid and in the absence of IPTG; 4th and 5th Lanes, with plasmid and in the presence of 2mM IPTG.