Tags: Chemical Compound, Chemical Substance.

Heme B or haem B (also known as protoheme IX) is the most abundant heme both hemoglobin and myoglobin are examples of oxygen transport proteins that contain heme B. The peroxidase family of enzymes also contain heme B. The COX-1 and COX-2 enzymes (cyclooxygenase) of recent fame also contain heme B at one of two active sites.

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