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Shown is the amino acid sequence for one peptide immunogen, PAO (128–144) (D135E/M136Q). The residues shaded yellow are identical between native strains PAO and PAK receptor binding domains. The boxed residues are the suggested key residues, (A128, D143, N144) and (E135, Q136), responsible for generating antibodies that are PAO or PAK specific, respectively.
