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3D presentation of human hemoglobin: chain α (red), and chain β (magenta). –White: heme particles; pink: residues involved in the P–P interaction; yellow: residues involved in ligand binding. The purpose of the highlighting (pink and yellow) is to indicate the position of those residues which cause the RD parameter to be increased. The program VMD was used to present the 3D form http://www.ks.uiuc.edu/Research/vmd/, accessed on 15 March 2021.
