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. 2014 Nov 30;22(6):491–496. doi: 10.4062/biomolther.2014.083

Fig. 1.

Fig. 1.

Heme-iron axial ligands. Histidine in COX protein and CO or oxygen can be axial ligands. Lights can displace gas molecules with oxygen, which functions as an electron acceptor to make water. Electron transport chain (ETC) located to inner membrane of mitochondria.