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  1. Interferons are antiviral proteins produced by a cell infected by a virus.
  2. They defend non-infected cells against viral infections, by binding with their receptors.
  3. Interferons constitute a specialized defence system that works against viral infections.
  4. They enhance the action of phagocytes and natural killer cells.
  5. Macrophages, fibroblasts and lymphocytes produce interferons
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