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Dendrogram based on PFGE patterns of ApaI-digested chromosomal DNAs from 10 different A. baumannii strains. Electrophoresis was performed with 0.8% agarose at 13°C (6 V/cm; high, 35 s; low, 2.2 s; in a linear manner for 18 h). The dendrogram was constructed with BioNumerics software (Applied Maths, Kortrijk, Belgium) as described in Materials and Methods. Percent similarity is indicated on the scale.
