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Phylogenetic relationships among the wzm genes from O1, O2ac, O3, O4, O5, O8, and O12 reference strains, as well as from the 10 K reference strains of an O1, O2, or O2ac serotype by iELISA (for which the principal antigen inhibited in the O2 iELISA system is O2a) (18). Bootstrap percentages of remarkable nodes are shown (distance scale, 0.1 represents 10% difference between sequences).
