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A hypothetical schematic explanation of the osmotic stress-induced inactivation of PSI and PSII in cyanobacterial cells. ●, Three extrinsic proteins, namely, the 33-kD protein, Cyt c550, and PsbU, of the oxygen-evolving machinery of PSII; ▪, plastocyanin or Cyt c553 associated with PSI. PM, Plasma membrane; TM, thylakoid membrane; I, PSI complex; II, PSII complex.
