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a. Representative images of IHC staining with an anti-PD-L1 antibody of esophageal cancer and adjacent non-malignant epithelium from TMA blocks. b. IHC staining with an anti-PD-L1 antibody of human esophageal cancer specimens. Images of representative slides are shown at magnifications of ×100 (left panel) and ×200 (right panel).
