IL-2 was expressed in the anterior surface layer, the blood vessel wall in the stroma, the cytoplasm of some cells, and the posterior pigment epithelium, suggesting weakened function of perivascular barriers in glaucoma patients, allowing cytokines to move from the blood into tissues, which is consistent with previous reports suggesting decreased function of perivascular barriers in glaucoma [97–99]. The gene discussed is IL2; the disease is glaucoma.