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Microphotographs of representative examples of IHC PD-L1 heterogeneity expression in MCs from lung cancer specimens. Positive membrane staining (brown) and negative PD-L1 staining are shown with PD-L1 E1L3N, E1J2J, SP142, 28-8, 22C3, and SP362 clone.×4 magnification and detail at×200 magnification. IHC indicates immunohistochemistry; MCs, malignant cells; PD-L1, programmed cell death ligand 1.
