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| Modern Genetic Analysis Chapter 13. Transposable Genetic Elements Transposons Figure 13-7. An explanation at the nucleotide level for the lollipop structure seen in Figure 13-6. The structure is called a transposon. (a) The transposon in its double-stranded form before denaturing. Note the presence of oppositely oriented copies of an insertion sequence (IS). (b) The lollipop struc-ture formed by intrastrand annealing after denaturing. The two IS regions anneal to form the IR of the transposon; the transposon genes are carried in the lollipop loop.

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