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Inventory of pathways for cyclic electron flow in cyanobacteria. Schematic representation of six different forms of cyclic electron transfer that may occur in cyanobacteria (A–F). The tentative H+/e− stoichiometry of each form of cyclic e− transfer is indicated. The electron acceptor of the Flv2–4 protein has not been characterized yet. This cyclic transfer of electrons may make the NADPH and ATP output of the photosynthesis machinery different from the 3/2 textbook ratio.
