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Photosystem II (PSII) catalyzes the unique reaction of light-dependent water oxidation and subsequent reduction of plastoquinone at the beginning of the photosynthetic electron transport chain. The mature complex consists of at least 20 protein-subunits and over 80 cofactors. Further proteins are required for biogenesis and repair of PSII. Most of these proteins interact specifically with assembly intermediates during defined steps in PSII assembly. This review shall emphasize the function of the two factors Psb27 and Psb28 during the biogenesis and repair of PSII in cyanobacteria and give an impression of their potential biochemical, structural and physiological properties in plants considering the fact that they both have homologues in all oxygenic photosynthetic organisms. We hypothesize that Psb28 may have retained its function in higher plants while the two Psb27 forms bind differently to PSII intermediates depending on PSII core phosphorylation state.