Fig. 1From: Heterogeneous programmed death-ligand 1 expression in gastric cancer: comparison of tissue microarrays and whole sectionsPD-L1 immunohistochemical expression. An overview of an immunohistochemical staining TMA. b, c Are two cores of the TMA from the same patient. b Negative staining, and c shows positive staining. Magnification a: ×2.5; b: ×4 (×200 for insert); c: ×4 (×200 for insert)Back to article page