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Using electron microscopic heteroduplex analysis, we have demonstrated that an insertion found in a Mu prophage and in some infectious. Mu deletion-substitution mutants derived from it consists of bacterial insertion sequence IS2 linked directly to IS5. Other infectious Mu mutants derived from the same lysogen have only IS5 or a portion of IS2. In addition, we have found that an independent insertion in a transducing phage, lambda 13 dargB2, is IS5. The ends of IS5 are short, inverted duplications of each other. These observations support the notion that the DNA insertion previously designated IS5 on the basis of a single example in lambda KH100 is a bona fide bacterial insertion sequence.

Adjacent insertion sequences IS2 and IS5 in bacteriophage Mu mutants and an IS5 in a lambda darg bacteriophage