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Figure 4: The Raman spectra of (a) consecutively adsorbed SpA and IgG on SAM-Au surface and (b) SpA + IgG interacting molecules adsorbed from SpA and IgG mixed solution on SAM-Au surface. Conditions of spectra recording: time acquisition 300 s, wavelength 785 nm, nominal power laser 10 mW, optical microscope objective 100x.