Cytokine which binds to interferon gamma receptor 1 (ifngr1) (PubMed:29742458). Also binds with lower affinity to interferon gamma receptor 1-like (ifngr1l) (PubMed:29742458). Has activating effects on macrophages and neutrophils (By similarity). Homodimer. Strongly up-regulated in response to viral hemorrhagic septicaemia virus infection. Belongs to the type II (or gamma) interferon family.