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Time-limited digestion with Bal31 exonuclease of UAB_Phi78 and UAB_Phi87 DNA followed by digestion with HindIII and SpeI, respectively. Arrows indicate the sequentially degraded DNA bands of 2200 and 2080 bp for UAB_Phi78 (A) and of 4322 and 2819 bp for UAB_Phi87 (B). M: marker lanes containing a mixture of λ DNA digested with BstEII and φX174 digested with HinfI (M1), λ-DNA-digested HindIII (M2), and λ-DNA-digested BstEII (M3). Sizes (bp) are indicated on the left side of the images.
