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Dendrogram of pulsed-field gel electrophoresis (PFGE) patterns based on AscI digestion of 424 L. monocytogenes isolates from raw pork and environments in retail market. The PFGE patterns (PTs), serotypes, sequence types (STs), sources and number of strains are shown at right (MCS, meat contact surface; NMCS, non-meat contact surface; I, insects; M, raw pork).
