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Produced by macrophages, IFN-alpha have antiviral activities. Interferon stimulates the production of two enzymes: a protein kinase and an oligoadenylate synthetase
![Bioactivity IFN-alpha F/IFNA21 [Unconjugated]](http://images.novusbio.com/fullsize2/11159-if_recombinant-human-ifn-alpha-21-ifna21-protein-cf-284202213288.jpg)
![SDS-PAGE IFN-alpha F/IFNA21 [Unconjugated]](http://images.novusbio.com/fullsize2/11159-if_recombinant-human-ifn-alpha-21-ifna21-protein-cf-sds-page-2842022134124.jpg)