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Resolution and quality of the electron density. Comparison of the quality of the Fourier (2Fo-Fc) sum electron density around adenosine monophosphate in crystal structures obtained at various resolutions (1σ threshold). (A) 2.85 Å, ATP in the crystal structure of the KaiC protein from Synechococcus elongatus; (B) 1.80 Å, A residue in the crystal structure of a B-form DNA; (C) 1.10 Å, atomic resolution, A residue in the crystal structure of an A-form DNA.
