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Hexameric structure of SAA1. (A) Two orthogonal views of the hexameric SAA1 structure in space group R32. The SAA1 hexamer was centered on the crystallographic threefold axis with a twofold axis-related dimer in the asymmetric unit. (B and C) Trimer interface (B) and dimer interface (C) residues in the SAA1 hexamer. The key contact residues are indicated by sticks in the enlarged views. The buried N-terminal helix 1 is shown as a colored surface.
