Heme


Heme is made up of a protoporphyrin IX and an iron atom which is found at the center of the molecule. Protoporphyrin is composed of four 5-membered pyrroles, or heterocyclic rings, which are fused together to form a tetrapyrrole. Fe2+ is held at the center of the molecule via the four pyrrole nitrogen atoms shown here.
The colors of the atoms are as follows: Carbon=Green, Nitrogen=Royal blue, Hydrogen=Sky blue, Sulfur=Red, and Iron=White.

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