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Diagrammatic illustration of the VlsE structure. VlsE consists of two invariable domains at the amino and carboxyl termini and a variable one at the center. The variable domain contains six variable regions, VRI to VRVI, and six invariable ones, IR1 to IR6. The sequences of the invariable regions are based on those of the variable domain of VlsE expressed by strain IP90 of B. garinii (11).
