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(A) Clustal alignment of the promoter region of the p28-19 gene of the E. chaffeensis isolates studied. Low-passage isolates V1, V4, and V7 represent the three genetically defined groups Arkansas, 91HE17, and Sapulpa, respectively. (B) Clustal alignment of the coding region of the p28-19 gene of E. chaffeensis isolates. V1, V4, and V7 represent the three groups Arkansas, 91HE17, and Sapulpa, respectively.
