Interferon gamma receptor 1 (IFNGR1) also known as CD119 (Cluster of Differentiation 119), is a protein that in humans is encoded by the IFNGR1 gene. The gene IFNGR1 encodes IFN-γR1, which is the ligand-binding chain (alpha) of the heterodimeric gamma interferon receptor, which is found on macrophages. IFNGR2, encodes IFN-γR2, the non-ligand-binding partner of the heterodimeric receptor.