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Analysis of genomic DNA from recombinant viruses generated using the Flip-Flop HSV-BAC system. DNA from two independent isolates was purified, digested with HindIII and electrophoresed on an agarose gel. The DNAs of parental viruses bM24-BAC and d120 illustrate the common fragments, while the asterisks denote fragments containing inserts derived from the shuttle vector. [see Additional file 3].
