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Rnr1 complexes. (A) The dimer of Rnr1 is displayed as a cartoon with the monomers colored blue and green. Surfaces for Rnr2pep and Rnr4pep are displayed in yellow and pink, respectively, and AMPPNP (gray) and GemdP (red) are shown binding to the specificity and catalytic sites. (B and C) The 2Fo–Fc electron density contoured at 1.0 σ for CDP (B) and GemdP (C).
