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Structure of the metal-binding site in Amydetes viviani firefly luciferase: (A) Zoom showing the metal-binding site residues (yellow: H310; green: E311; magenta: E354) and oxyluciferin phenolate binding site (deep blue); (B) Metal-binding site showing zinc in red, being coordinated by the side chains of H310, E311 and E354. Reprinted from ref. [31].
