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ICEPm1 precisely excises from the chromosome at pheV. Sequences obtained by direct sequencing of PCR products for attL, attB, attI, and attR are aligned. All four products share the same 52-bp direct repeat (DR, shaded in black). Alignments also show the intact pheV-tRNA sequence maintained when ICEPm1 is integrated into the chromosome (attL) and when it is excised (attB).
