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Plasmids from representative MDR Salmonella serovar Typhi strains isolated in 1993 and 1996. Lane 1 contains E. coli 39R size markers of 98, 24, 24, and 4.5 MDa. (This gives a predicted mass of around 140 MDa; however, the gel indicates that the plasmids have masses of around 110 MDa.) Lanes 2 to 7 contain MDR Salmonella serovar Typhi from 1993. Lanes 8 to 13 contain MDR Salmonella serovar Typhi from 1996. Lane 14 contains E. coli 39R.
