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(A) Fo − Fc simulated annealing omit map for residues 36–42 in the trimeric, swapped form of barnase. The map is contoured at 3σ. (B) 2Fo − Fc map of the trimer interface contoured at 1σ. The network of hydrogen bonds linking Ser-38, the sulfate, and water molecules is shown. (C) 2Fo − Fc map of the trimer interface contoured at 1σ: Stacking interactions between symmetry-equivalent Phe-82 side chains.
