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(a) An oxidative chemical reaction breaks the aromatic ring of Trp during absorption of UV light. (b) and (c) The overall structure of HγD-Crys protein. The backbone of each domain is represented as cartoon (green, N-terminal domain; Cyan, C-terminal domain). The Trp residues in the protein are presented as spheres (Yellow, N-terminal domain; Magenta, C-terminal domain).
