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The upper panel shows the amino acid sequence of the microcin S precursor. A probable leader peptide is underlined. Asterisks indicate cysteines possibly involved in the formation of a disulfide bond typical for class II microcins. The microcin S gene cluster on megaplasmid pSYM1 (lower panel) consists of the four clustered genes mcsS, mcsI, mcsA and mcsB. ORF1 and ORF2 revealed no bactericidal activity.
