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Identification of the attP, attL, and attR sites. Southern blots of phage MM1 (lanes 1) and strain 949 (lanes 2) DNAs digested with DraI and hybridized with MM1 DNA (A) or with the 1.7-kb DraI MM1 DNA fragment containing the attP site (B) are shown. Arrows indicate the sizes of relevant bands, in kilobases.
