Figure 1

|2Fo-Fc| electron-density maps (contoured at 2.0 σ) of the heme group, proximal and distal His residues and CO molecules involved in the iron coordination of α (A) and β (B) chains of Hb1EmCO_hexa.

|2Fo-Fc| electron-density maps (contoured at 2.0 σ) of the heme group, proximal and distal His residues and CO molecules involved in the iron coordination of α (A) and β (B) chains of Hb1EmCO_hexa.