KENNETH EWARD / BIOGRAFX / SCIENCE PHOTO LIBRARY KENNETH EWARD / BIOGRAFX / SCIENCE PHOTO LIBRARY
LIBRARY Haemoglobin. Molecular graphic of the haemoglobin molecule with a haem group highlighted in colour. Most of the molecule appears transparent. The carbon chain around the haem group is coloured red, nitrogen atoms in the porphyrin ring are yellow and the central iron atom is silver. Haemoglobin is the oxygen-carrying pigment in red blood cells. It consists of four globin polypeptides, each of which carries a haem group with a central iron atom, which binds reversibly to oxygen. The porphyrin ring around the iron atom.
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