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Allosteric site in structures resulting from soaked crystals. (A) Soak in calcium acetate. (B) Soak in magnesium acetate. (C) Backsoak from magnesium acetate to calcium acetate. The three structures are superimposed on the Ras structure from crystals taken directly from the mother liquor containing calcium acetate, depicted in gray. The 2Fo-Fc electron density maps were contoured at the 1σ level.
