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Comparison of native and acquired arc operons in S. epidermidis 1457. Percentages of amino acid (AA) identity between genes of the native (arcA1B1D1R1) and acquired (arcA2D2R2B2C2) arc operons are shown. arcA1 and arcA2 allelic replacement is also indicated. Note that the arginine-dependent transcriptional regulator, consisting of argR1 and argR2, is an independent transcriptional unit encoded upstream of arcA1 and arcA2.
