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| Modern Genetic Analysis Chapter 13. Transposable Genetic Elements Insertion Sequences Figure 13-5. A model to explain the heteroduplex DNA structure shown in Figure 13-4. IS1 is represented by the maroon lines; a and b represent the ends of the IS1 mole-cule; H and L represent the strands of ldgal DNA with high and low buoyant densities, respectively. The hybrid can be explained by assuming that the IS1 sequence is inserted in opposite directions in the two mutants.

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