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Associates with IFNGR1 to form a receptor for the cytokine interferon gamma(IFNG)(PubMed:8124716, PubMed:7673114,PubMed:7615558). Ligand binding stimulates activation of the JAK/STAT signaling pathway(PubMed:8124716, PubMed:7673114, PubMed:15356148). Required for signal transduction in contrast to other receptor subunit responsible for ligand binding(PubMed:7673114).