IFNA21 (Interferon Alpha 21) is a Protein Coding gene. Diseases associated with IFNA21 include Rubella. Among its related pathways are Response to elevated platelet cytosolic Ca2+ and RIG-I/MDA5 mediated induction of IFN-alpha/beta pathways. IFNA21 is a member of the alpha interferon gene cluster on the short arm of chromosome 9. Interferons are cytokines produced in response to viral infection that mediate the immune response and interfere with viral replication. The encoded protein is a type I interferon and may play a specific role in the antiviral response to rubella virus.