Fig. 1From: Spatial and temporal heterogeneity of tumor immune microenvironment between primary tumor and brain metastases in NSCLCRepresentative immunohistochemical staining image of NSCLC and its paired brain metastases (not from the same patients). A–M list the typical immunohistochemical images of CTLA-4, PD-1, PD-L1, B7-H3, B7-H4, IDO1, EphA2, CD3, CD4, CD8, CD20, CD68, and CD163, respectively. Scale bars, 100 μm, Original magnification 200×Back to article page