Abstract
SUMMARYThe gene for resistance to phage BF23 and colicins E1, E2and E3,bfe, was mapped by a combination of conjugation and transduction crosses. Co-transduction ofbfewas found with markers in the region between 76 and 79 min on theEscherichia coligenetic map. The highest frequency of co-transduction was found withargH(47%). Three-factor transductional crosses showed unambiguously thatbfelies betweenargHandsupM, at about 77·5 min on the map.
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