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Incubation of cells of the cyanobacterium Spirulina platensis under conditions of exposure to low-intensity (2–3 μE m–2 s–1) red light, which was predominantly absorbed by photosystem I (PS I), caused atypical adaptation changes. Invariable pigment composition and stoichiometry of the photosystems was observed in the cells incubated under these conditions against the background of a decrease in the...