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Discriminatory amino acid positions within the immunoprotective domain of the SpaA protein of Erysipelothrix rhusiopathiae. Amino acid (AA) variant positions with respect to the Fujisawa reference sequence are listed in the top row, with the amino acid found in the reference sequence shown in the second row. The phylogenetic tree shown to the left shows the relatedness among the SpaA sequence variants. Variants in each group are shown in blue boxes, with the AA change indicated.
