Abstract
To identify the second region of sequence nonhomology between the genomes of the transposable bacteriophages Mu and D108 originally observed by electron-microscopic analysis of DNA heteroduplexes and to localize functions ascribed to the ‘accessory’ or ‘semi-essential’ early regions of the phages between genes B and C, a 0.9-kb fragment of each genome located immediately beyond the B gene was cloned and sequenced. Three open reading frames (ORFs) were identified in each. The region of nonhomology is located within the 3' portion of the third ORF. D108 is shown to possess a Kil function similar to that previously shown for Mu and that function is encoded by the first ORF.
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