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Sodium ions (violet spheres) in all structures of the factor Xa group; (A) Models 3HPT and 3K9X; (B) Model 3ENS; (C) Model 3WS2. The mF ob– DF model (green) and 2mF obs–DF model electron density maps are contoured at 3σ and 2σ, respectively, except in the case of 3SW2:B, where the contours are 4σ and 1.5σ. Water molecules are displayed as red spheres.
