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=== Electron transport chain ===
=== Electron transport chain ===


In the electron transport chain, cyt c shuttles electrons between the respiratory complexes III and IV.
In the electron transport chain, cyt ''c'' shuttles electrons between the respiratory complexes III and IV. Initially, the heme iron is in the reduced, Fe<sup>3+</sup> state; this allows for the uptake of one electron, oxidizing the iron to the Fe<sup>2+</sup> state.