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Alignment of amino acid sequences of Sca proteins detected in the genomes of O. tsutsugamushi strains. The passenger domains of the genes identified in the indicated strains were compared. (A) ScaA; (B) ScaC; (C) ScaD; (D) ScaE. The conserved sequences are boxed, and the internal repeat sequences detected in ScaD are underlined with red and blue lines.
