Fig. 1From: Programmed death ligand 1 and tumor-infiltrating CD8+ T lymphocytes are associated with the clinical features in meningiomaRepresentative images of immunohistochemical analysis in meningiomas. Positive control (a), negative control (b), PD-L1 protein (c), and CD8 protein (d) in immunohistochemistry analyses of meningiomas. Scale bar = 20 μm. PD-L1, programmed death ligand 1Back to article page