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DNA sequence of IS1549. The 11-bp inverted repeats are indicated by underlining. The 504-amino-acid ORF is shown as well as the positions of the primers (indicated beneath the sequence by arrows) used for sequence analysis and PCR to determine the distribution of the element. The amino acid sequence which has homology to the highly conserved C1 signature sequence [Y-(X2)-R-(X3)-E-(X6)-K] of the IS4 family of insertion elements is shown in bold type.
