FIG. 3.

Silk biomaterial fluorescence. (A) Fluorescence excitation-emission matrix of silk in solution. Arrows indicate major contributions from tyrosine, tryptophan, and crosslinks. (B) Representative fluorescence emission spectra acquired at 265 nm and (C) 310 nm from silk in solution, gel, and scaffold configurations are shown as solid lines. Reproduced with permission from Georgakoudi et al.¹⁷