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Comparison of empirically predicted (red) and directly measured experimental (black) spectra of penetratin. (a) Molecular model of penetratin peptide, including one phenylalanine (purple) and two tryptophans (green). (b) Raman spectra. (c) SERS spectra. (b) Red lines, predicted Raman; black lines, experimental Raman. (c) Black lines, predicted SERS; red lines, experimental SERS. Adapted from Wei et al. (2008). Copyright © ACS Publishing (2008).
