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Conservation of Ser/Thr residues (highlighted) in the tandem repeats encoded by A. marginale msp1α from different isolates. The amino acid positions are indicated above the sequences. The arrowhead points to the 20th amino acid, which is involved in interaction with tick cells. The neutralization-sensitive epitope recognized by monoclonal antibody ANA15D2 is indicated by the bracket. Sequences were obtained from reference 20a.
