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Effects of a hypertonic environment on fluorescence emission spectra at 77 K in cephalodia (A) and green algae-containing compartments (B) of S. sorediiferum. Samples were incubated in different sorbitol concentrations for 30 min (cephalodia) or 1 h (green algae-containing compartments), and fluorescence emission spectra were measured at 77 K. RU, Relative units.
