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A sole member makes up the type II interferons (IFNs) that is called IFN-γ (gamma). Mature IFN-γ is an anti-parallel homodimer, which binds to the IFN-γ receptor (IFNGR) complex to elicit a signal within its target cell. IFNGR is made up of two subunits each of molecules designated IFNGR1 and IFNGR2.
References
Interferon type II Wikipedia(Text) CC BY-SA