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FRL-specific changes in the ETC.A, ETC cofactors present in the apo-FRL-PSII structure are shown. The Chl d and the FRL-specific PsbD3-Tyr191 are shown with a pink glow. Isoprenoid tails are truncated for clarity. B, model in the sharpened ESP map (17σ) near PD2 showing the H-bond donation from FRL-specific PsbD3-Tyr191 to the 132 methoxycarbonyl O atom of PD2. ESP, electrostatic potential; ETC, electron transfer chain; FRL, far-red light; PSII, photosystem II.
