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Mutation of the Trp92 that is known to lie within the active site of the photoprotein obelin from Obelia longissima, results in a shift of the bioluminescence color from blue (λ max =485 nm) to violet. The corrected spectrum shows a new band with λ max =410 nm now contributing equally to the one at longer wavelength. The crystal structure of this W92F obelin determined...
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