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Heme is a ringlike organic compound that is known as porphyrin, which an iron atom is bonded too. There are four heme groups in hemoglobin. The iron atom is what binds oxygen as our blood travels through our vessels.
This is a heme group, with Fe ion at the center and surrounded by four coordinated N atoms. Typically, Fe ion in the heme group will bind to six ligands; in a hemoglobin, the other two ligands usually are an oxygen molecule and an amino acid histidine.
- 200px-Heme_b.svg.png (9.25 KiB) Viewed 58 times
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