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Low-temperature (77 K) fluorescence emission spectra for four cyanobacterial strains grown in white light (WL) or far-red light (FRL). (A) Chr. thermalis PCC 7203; (B) Calothrix sp. PCC 7507; (C) F. thermalis PCC 7521; (D) Chlorogloeopsis sp. PCC 9212. The excitation wavelength was 440 nm, which predominantly excites Chls.
