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The Salmonella flagellar operons are divided into three classes with reference to their relative positions in the transcriptional hierarchy. Expression of the class 2 operons requires the class 1 gene products, FlhD and FlhC, and is enhanced by an unknown mechanism in the presence of the class 3-specific sigma factor, FliA, and in the absence of its cognate anti-sigma factor, FlgM. In this study, the transcriptional start site mapping was performed by primer extension analysis for five class 2doi:10.1266/ggs.74.179 pmid:10650844 fatcat:e7w54abshjaqpixq4f4nsdoomy