Fig. 6 Raman-driven analysis of the different isomerization and protonation states of the chro-
mophore of EYQ1. (a) Raman spectra of anionic cGFP (in aqueous solution of NaOH at pH
dashed blue line ) and of tGFP (in acetonitrile, same data of dark green curve in Fig. 5a ).
(b) Raman spectra of native EYQ1 ( blue solid line ) and of its photoconverted form ( dark green