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| Modern Genetic Analysis Chapter 13. Transposable Genetic Elements Transposons Figure 13-8. Two different transposons having different IR regions and carrying different drug-resistance genes. (a) Tn9 has a short IR region, because the two IS1 elements are in the same orientation and each element has a short inverted repeat. (b) Tn10 has a large IR region because the two IS10 components have opposite orientations, and the entire IS10 sequence constitutes the inverted repeat.

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