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Southern hybridization analysis of rRNA genes in 117 V. cholerae O139 strains isolated from 1993 to 1999 in China. Genomic DNA was digested with BglI and hybridized with a digoxigenin-labeled 16S rRNA gene probe. The ribotyping patterns are rb1 to rb7. The numbers indicating the molecular sizes of the bands correspond to a λ DNA HindIII marker.
