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Plastocyanin is a copper-containing protein that plays a crucial role as an intermediary in photosynthetic electron transport. This process occurs within chloroplasts, which are organelles found in the cells of green plants and algae. Plastocyanin is water-soluble and moves within the thylakoids of chloroplasts, carrying electrons from one point to another in the electron transport chain, which is essential for photosynthesis.123

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