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Quaternary structures of proteins with the lectin fold. The crystal structures used are pea lectin (32), bovine S-lectin (33), peanut lectin (34), jack bean concanavalin A (35), and human serum amyloid P-component (11). The hexameric Limulus C-reactive protein (Limulus CRP) structure has been generated on the basis of sequence similarity with serum amyloid P-component (36). Symmetry axes are indicated for each structure. Arrows represent 2-fold axes in the plane of the paper.
