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Overview of the NTE activity and tongue refolding caused by Pfr formation in oat phyA3. The NTE region (shown as a cloud) is more compact with the Pfr chromophore (purple) relative to that in Pr (cyan), as indicated by dashed lines. For the tongue region undergoing an α-helix formation and a β-sheet melting, the conformational rearrangement of the conserved PRXSF motif and WGG motif is highlighted (amino acids shown as spheres).
