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The 2Fo-Fc omit electron density maps (left, contoured at 1.0 σ), the Fo-Fc omit electron density maps (right, contoured at 3.0 σ) and the final model of the heme active sites of the αsubunit (top) and βsubunit (bottom) of R-state Hb(NO) (PDB access code: 4N8T, 1.9 Å resolution; this work).
