Type I IFNs are important in antiviral immunity. Two studies report the identification of another family of molecules that have similar properties to the type I IFNs but are otherwise structurally and genetically distinct.
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Vilcek, J. Novel interferons. Nat Immunol 4, 8–9 (2003). https://doi.org/10.1038/ni0103-8
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DOI: https://doi.org/10.1038/ni0103-8