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Polymorphic sites in each of the six gene fragments studied. The nucleotides present at each variable site among the 31 V. cholerae isolates are shown for allele 1. For the other alleles, only sites that differ are shown; sites that are the same as those in allele 1 are indicated by periods. Polymorphisms that are synonymous (S) and nonsynonymous (N) are indicated below the sequences. Sites are numbered above in vertical format.
