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Redox poising of electron transporters of the cyclic PET by chlororespiratory reactions. Closed gray line with arrows corresponds to cyclic PET where only plastoquinone (PQ) and photosystem I (PSI) are shown. i1 and i2 are the influxes of electrons from, respectively, photosystem II (PSII) and from NADH (through the thylakoid Ndh complex). o1, o2, and o3 are the outfluxes of electrons to, respectively, NADP+, Mehler reaction, and plastoquinol peroxidase.
