Geis illustrates the hemoglobin molecule in its oxygenated state.

Used with permission from the Howard Hughes Medical Institute (www.hhmi.org). All rights reserved.

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Related PDB Entry: 3A0G

About Oxyhemoglobin

Oxyhemoglobin is the form of hemoglobin that contains oxygen molecules. Hemoglobin is a protein molecule that binds to oxygen. Hemoglobin forms an unstable, reversible bond with oxygen. In its oxygen-loaded form, it is called oxyhemoglobin and is bright red.