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Three IS5 elements were mapped in overlapping chromosomal segments on a series of F-prime plasmids by restriction analysis and hybridization. IS5A was located clockwise of proA near 6 min, IS5B was located clockwise of purE near 12 min, and IS5C was tentatively located near 14 min on the Escherichia coli K-12 map. The physical structures of nine type II F-prime plasmids that contain chromosomal DNA from this region indicated that these plasmids were excised from the chromosome by recombination between pairs of IS5 elements.

Mapping of chromosomal IS5 elements that mediate type II F-prime plasmid excision in Escherichia coli K-12