DENNIS KUNKEL MICROSCOPY / SCIENCE PHOTO LIBRARY DENNIS KUNKEL MICROSCOPY / SCIENCE PHOTO LIBRARY
Light micrograph (LM) of Haemoglobin crystals. Haemoglobin or haemoglobin is the iron-containing oxygen-transport metalloprotein in the red cells of the blood in mammals and other animals. The molecule consists of globin (the apoprotein) and four heme (haem) groups (an organic molecule with an iron atom). At the core of the molecule is a heterocyclic ring, known as a porphyrin which holds an iron atom; this iron atom is the site of oxygen binding. Decreased levels of haemoglobin, with or without an absolute decrease of red blood cells, leads to symptoms of anaemia. Magnification: x50 when shortest axis printed at 25 millimetres.
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