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77 K chlorophyll fluorescence emission spectra of wild-type (wt) and ΔmrgA cells. Chlorophyll fluorescence spectra at 77 K of wild-type cells and ΔmrgA grown for 190 to 210 h in YBG11 medium containing 10 μm iron with (w) or without (w/o) the addition of 50 μm DFB were measured. The mean fluorescence peak ratios of the six biological repeats are shown.
