PDB ID: 1HDA M.F. Perutz, G. Fermi, C. Poyart, J. Pagnier, J. Kister A Novel Allosteric Mechanism in Hemoglobin J. Mol. Biol. 233 pp. 536 (1993)"

Click to see an image of the hemoglobin molecule in the ball and stick format. Rotate it, and enlarge it. Constrast its shape with that of collagen.

Click to see the structure represented in the ribbon format. Notice the many regions containing a helical structure.

Hemoglobin contains different regions of protein, called subunits. Click to see theses subunits identified by color.