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PFGE patterns of STEC serotypes O157:H7 and O26:H11 isolated in Finland from 1990 to 1997. Lanes 1 and 12, bacteriophage lambda ladder PFG marker 340 (New England Biolabs Inc., Beverly, Mass.); lane 2, subtype 1a; lane 3, subtype 1b; lane 4, subtype 1c; lane 5, subtype 1d; lane 6, subtype 1e; lane 7, subtype 1f; lane 8, subtype 1g; lane 9, subtype 2a; lane 10, subtype 2b; lane 11, subtype 2c.
