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The photo-induced reduction in the level of the antenna chlorophyll-binding proteins CP43 and CP47, as well as the reaction-center-forming protein D1, in Photosystem II was studied with PS II membranes and PS II complexes that had been treated with alkaline Tris. The loss of CP43, as detected by sodium dodecyl sulfate/urea polyacrylamide gel electrophoresis, was attributed mostly to specific cross-linking...