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Fluorescence spectra of dipeptides (A) S-FE, (B) C-FE, (C) C-GE, (D) FBA-FE and (E) FE. Unassembled solutions and self-assembled solutions were prepared in pH 6.0 PBS buffer (1X) at 0.1 mM and 36 mM, respectively. Self-assembled samples (36 mM) were allowed to self-assemble for 2 h before analysis. All samples were excited at λex = 290 nm, and emission spectra were collected from 300–530 nm.
