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Monomeric and trimeric pigment-protein antenna complexes of photosystem I (PSI) isolated from cyanobacteria Arthrospira platensis were studied both experimentally and theoretically. An exciton model was proposed to explain one of PSI spectral features: low energy states, whose energies are red-shifted in comparison with those of PSI reaction center. We present results of the modeling of linear and single molecule spectroscopy.