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Comparison of PFGE profiles of E. coli O157:H7 Sakai and its derivatives. A total of 4 strains were digested using XbaI in this assay. A Salmonella enterica serotype Braenderup reference standard (H9812), also restricted with XbaI, was used as a size standard (M). The approximate size of each marker band is presented in kilobases. The white arrow highlights the 187-kb band observed only with WT Sakai.
