Fig 8. EGF fluorescence excitation and emission spectra acquired before and after 295 nm illumination for 2 hours.

Trp fluorescence excitation and emission wavelengths were fixed at 295 m and 330 nm, respectively. Excitation slit size was set at 2.0 mm (4.40 μW) and the temperature of each solution was kept at 20°C for all experiments.