IFN-Omega 1 is a type I interferon,that can be induced by virus-infected leukocytes. Type I interferon family members,which include IFN-alpha,IFN-beta,and IFN-omega,signal through IFNAR-1/IFNAR-2 receptor complex,and wield antiviral and antiproliferative activities. IFNW1 exhibits about 75% sequence homology with IFN-a,and contains 2 conserved disulfide bonds,which are essential for full biological activity.