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PFGE. Lanes 1, 2, and 3, S. flexneri strains belonging to group F-I; lanes 4, 5, and 6, S. flexneri strains belonging to group F-II; lanes 7, 8, and 9, S. flexneri strains belonging to group F-III; lanes 10 and 11, S. flexneri strains belonging to group F-IV; lanes 12 and 13, S. dysenteriae strains; lanes 14 and 15, S. sonnei strains.
