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[[File:Q-cycle cytochrome b6f.png|thumb|right|450px|Q cycle of cytochrome b<sub>6</sub>f]]
'''First half of Q cycle'''
# QH<sub>2</sub> binds to the positive 'p' side (lumen side) of the complex. It is oxidized to a [[semiquinone]] (SQ) by the iron-sulfur center (high-potential ETC) and releases two protons to the thylakoid lumen{{Citation needed|reason=Semiquinones have lost just a single proton and single electron. Why does this say that two protons are released?|date=February 2017}}.
# The reduced iron-sulfur center transfers its electron through cytochrome f to Pc.
# In the low-potential ETC, SQ transfers its electron to heme b<sub>p</sub> of cytochrome b6.
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