Fig. 6. (A) Relative Raman band intensities at 500 (a), 750 (b), 1000 (c), 1120 (d), and 1586 cm^–1 (e) in the SERS spectra of MCF-7 cells as a function of irradiation time. (B) Map of the relative rate of intensity changes of bands at 500, 750, 1000, 1120, and 1586 cm^–1 in the SERS spectra of MCF-7 cells (red curve), A549 (green curve), and HeLa (blue curve).