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The 77K fluorescence analyses of the wild type, Δnd4, pgrl1, and Δnd4pgrl1. Relative content of PSI and PSII monitored with low-temperature emission spectra (77K fluorescence) normalized to their amplitude at 685 nm for the wild type (A), pgrl1 (B), Δnd4 (C), and Δnd4pgrl1 (D) grown photoautotrophically in CL or HL and DCMU-poisoned before freezing. Two mains peaks are resolved at 685 nm and in the 710-nm regions, which correspond to fluorescence by PSII and PSI, respectively.
