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WSP gene structure. (A) Schematic representation of WSP structure depicting the signal peptide (SP), the four hypervariable regions (HVRs), interspaced by four conserved regions (CRs). (B) Representatives of most diverse WSP sequences named by a corresponding allele. Sections used for typing include HVR motifs plus short stretches of the two flanking CRs (bracketed below the two alignments).
