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Multiplex PCR standardization results: 2% agarose gel electrophoresis stained with ethidium bromide. Lane 1: molecular size marker; lane 2: negative control, lane 3 and 4: Shigella flexneri strain 50(ipaH+/ial+); lanes 5 and 6: Shigella flexneri strain 01 (ipaH+/ial+).
