Interferon:
One of a number of antiviral proteins that modulate the immune response. Interferon alpha (IFNa) is secreted by a virally infected cell and strengthens the defenses of nearby uninfected cells. A manufactured version of IFNa (trade names: Roferon, Intron A) is an FDA-approved treatment for Kaposi's Sarcoma, hepatitis B, and hepatitis C. Interferon gamma is synthesized by immune system cells (Natural Killer [NK] Cells and CD4 cells). It activates macrophages and helps orient the immune system to a mode that promotes cellular immunity (Th1 response).
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