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From conjugational data, the attachment site for noninducible coliphage 186 (attl86) was located between the origins of Hfr strains KL16 and KL98, and close to the pheA gene in Escherichia coli K-12. P1 transductions indicated that attl86 lies at 51 min on the standard genetic map of E. coli, with the order cysC-nalB-attl86-pheA. The presence of prophage 186 in the donor destroyed linkage between nalB and pheA, which is taken as evidence for the integration of the 186 prophage between thesedoi:10.1128/jb.111.2.303-307.1972 fatcat:kzk5njpwzrdcbjot5ytvgxrdvy