Illustration of hemoglobin (deoxyhaemoglobin) as a glass surface model with indicated deeper ribbon model and parts as rod model on dark background. Hemoglobin is the protein complex of red blood cells (erythrocytes) whose task is to bind oxygen and carbon dioxide and thus transport them in the bloodstream. The illustration is based on structural data from Perutz, M.F., by medicalgraphics/F1online

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