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| Modern Genetic Analysis Chapter 13. Transposable Genetic Elements Insertion Sequences Figure 13-2. Electron micrograph of a ldgal+ / ldgalm DNA heteroduplex. The single-stranded loop (arrow) is caused by the presence of an insertion sequence in ldgalm. (From A. Ahmed and D. Scraba, "The Nature of the gal3 Mutation of Escherichia coli," Molecular and General Genetics 136, 1975, 233.)

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