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Possible photoprotective mechanism of the PsbA1/PsbA3 exchange. Charge recombination in PsbA1-PSII leads to an increased repopulation of the excited P680 and thus to a higher production of harmful singlet oxygen production. This is avoided in the PsbA3-PSII by a higher non-radiative recombination and the harmless dissipation of excess energy. Cyt b-559, cytochrome b 559; Cyt c-550, cytochrome c 550.
