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Localization of PD‐L1 on SkBr‐3 cells by iSERS microscopy. Fluorescence images (1A, 2A, 3A, 4A), iSERS false‐color images (1B, 2B, 3B, 4B) and mean SERS spectrum (1C, 2B, 3B, 4B). Scale bar is 5 μm. iSERS, immuno‐SERS microscopy; SERS, surface‐enhanced Raman scattering
