Inflammatory cytokines are expressed in human stroke. Immunohistochemical analysis of cytokine expression in ischemic brain tissue (A-D) and unaffected brain tissue (E-H). Immunohistochemical analysis was performed to detect CXCL-1 (A,E), CXCL-8 (B,F), TNF-α (C,G), and IFN-γ (D,H). Scale bars = 50 μm.