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. Author manuscript; available in PMC: 2011 Dec 1.
Published in final edited form as: PM R. 2010 Dec;2(12 Suppl 2):S292–S305. doi: 10.1016/j.pmrj.2010.10.013

Figure 3.

Figure 3

Complex IV (cytochrome c oxidase) is the principal chromophore involved in low-level light therapy. It has 2 copper centers and 2 heme prosthetic groups. Cytochrome c is oxidized and oxygen is reduced to water during respiration.