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Southern blot analysis of EcoRV-restricted bacteriophage DNA samples probed with UNL-1 DNA. Lane 1, lambda HindIII-digested size marker; lane 2, D3; lane 3, G101; lane 4, UNL-1; lane 5, F116d1; lane 6, UT1; lane 7, F116; lane 8, T4.