Figure. Gel showing the XbaI pulsed-field gel electrophoresis (PFGE) pattern of each isolate. Lane 1 and 9 show the pattern of the Salmonella strain used as a size standard. Lane 2 shows the pattern of MR-DT104 strain isolated in 1985. Lanes 3-5 show the patterns of MR-DT104 isolates obtained in 1990. Lanes 6-8 show the PFGE patterns of MR-DT104 isolates obtained in 1996.
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