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Agarose gel electrophoresis of PCR product obtained by PCR assay with oligonucleotide primer 2648-1806 with DNAs from E. coli strains. DNAs from E. coli H type strains are labeled with the H type numbers, and DNAs from other strains are labeled with the strain numbers. GeneRuler (1-kb DNA ladder) from Gibco Life Technologies was used as the molecular size marker.
