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Physical and genetic structure of transposon Tn1721 (length, 11,139 bp). The 38-bp inverted repeats IRL, IRR-I, and IRR-II are highlighted. The designation, position, and direction of transcription of genes are shown by the arrowed boxes. The region that comprises the minor transposon Tn1722 is highlighted, along with the location of EcoRI restriction sites. This diagram was adapted from Schnabel and Jones (39) and Tsuda et al. (45).
