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The integration frequency of phage att80 immlambdac1857 into the chromosome of a mutant strain H47 Escherichia coli K-12 deleted for the normal prophage insertion site is found to be about 20-fold decreased as compared with its integration into the wild type strain. The most of the resulting lysogens contain the prophage at the secondary attachment site of the mutant bacterial chromosome which is preferentially utilized for prophage insertion. This attachment site (att80-II) is located close to his-genes on the chromosome of H47 strain. Prophage curing procedure of such abnormal lysogens results in the appearance of rare auxotrophic heat-resistant survivors with the His- phenotype. In some cases the prophage insertion can induce an inversion of a neighbouring genetic region. Such lysogens contain the purC gene near prophage located at the att80-II site, and after curing they segregate the heat-resistant His- and Pur- colonies.
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