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PCR analysis of the wza-to-wzc region from different group 1 K serotypes of E. coli (A) and Klebsiella (B). For reference, K. pneumoniae K20 strain 889/50 is also shown in panel A and E. coli K30 strain E69 is shown in panel B. PCR products identical in size (1.8 kb) were obtained for all of the strains tested, indicating a conservation of gene order between clusters.
