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IS1(SB) and its two variants were identified as the major and minor IS1 elements in Shigella boydii. The nucleotide sequences of IS1(SB), IS1(O157:H7) from Escherichia coli O157:H7 and IS1F from E. coli K12 suggest that these IS1 elements had been horizontally transferred among S. boydii and E. coli O157:H7 and K12. The two IS1(SB) variants and IS1(O157:H7) have transposition activities 7- to 86-fold...
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