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Heteroduplex susceptibility to RecBCD nuclease digestion. A total cellular DNA preparation of a sample taken at 45 min after infection of wild-type cells (A) and clear lysate preparation of samples taken at 30 min after infection of recD xonA (B) and recD recJ (C) cells were digested by RecBCD nuclease as described in text. Heteroduplex strand polarity was determined as described in the legend to Fig. 2.
