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Raman spectra of Au/Ag core-shell colloids (A) and solid 4-mercaptobenzoic acid (B), as well as the surface-enhanced Raman scattering spectra of 4-mercaptobenzoic acid Au/Ag nanoparticles (C), latent membrane protein 1 Au/Ag nanoparticles (D), and 4-mercaptobenzoic acid latent membrane protein 1 Au/Ag nanoparticles (E), respectively.
