IFN-γ mainly produced by Th1 type cells, belongs to a member of the interferon family of type II cytokines, is a class of secreted glycoproteins, consisting of 143 amino acids, with a relative molecular mass of 16,942. IFN-γ is mainly produced by activated T cells and NK cells, with biological activities such as regulating the immune state of the organism, mediating cellular immunity, enhancing receptor-mediated phagocytosis, enhance the killing activity of macrophages and neutrophils, and have biological activities such as anti-viral infection and anti-tumor.