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Deduced amino acid sequence of Iha and homology to V. cholerae IrgA. The boxed amino acids represent a probable TonB box. +, conservative amino acid substitution. The arrows indicate the borders of amino acids deleted from Iha in E. coli O157:H7nalR(Δiha). The shaded amino acids were used to immunize rabbits to induce α-Iha antibodies. The dashes represent BLAST program-generated gaps between amino acids to maintain alignment of the proteins.
