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Model for chlororespiration in the dark involving the NADPH dehydrogenase (NDA2) and PTOX1 and PTOX2 (A) or only PTOX1 (B). Electron transfer rates kred (22) and kox (this work) allow us to calculate the oxidation state of the PQ pool from Eq. 3, here shown in %. Arrows’ thickness is proportional to the electron flow F through the enzymes, expressed per photosystem unit, and calculated from Eqs. 1 and 2.
