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SmaI RDPs of serotype a strains. Shown is genomic DNA from 17 Hia isolates after digestion with SmaI and separation of restriction fragments by PFGE. Lanes 1 and 19, molecular size standards. Lanes 2 to 8, major lineage strains. Lanes 9 to 13, second major lineage strains. Lanes 14 to 18, isolates of minor lineages.
