Amino acid sequence alignment of CT-B subunit of Vibrio cholerae O1 classical, El Tor, and Mozambique (B33 and B65) strains. Identical amino acid residues are indicated by a period. Amino acid sequences of ctxB of V. cholerae classical (AAL60524.1; AAM47189.1) and El Tor (AAM74192.1; AAM77066.1) are from GenBank.
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