The FES of intact dark-adapted cells (in state II) and thylakoid membranes of T. vulcanus NIES-2134 (A) and Synechocystis sp. PCC 6803 (B) recorded at 77 K, normalized to the maximum fluorescence emission. The excitation wavelength was 440 nm. The spectra are the average from seven to nine independent experiments; the shaded areas represent standard errors. Note that the spectra of cells from S. 6803 were recorded with 5 nm spectral bandwidth.