Recombinant Tumor Necrosis Factor α/TNF-α is a non-glycosylated cytokine produced from E. coli using rDNA technology. The protein consists of three identical polypeptide chains of 158 AA combined to form a compact bell-shaped homotrimer. The individual subunits have a relative molecular mass of 17,484 Daltons each. TNF-α is a potent lymphoid factor that exerts cytotoxic effects on a wide range of tumor cells and certain other target cells. TNFα is a homotrimer with a subunit molecular mass of 17 kDa and plays a major role in growth regulation, differentiation, inflammation, viral replication, tumorigenesis, autoimmune diseases and in viral, bacterial, fungal, and parasitic infections. Besides inducing hemorrhagic necrosis of tumors, TNF was found to be involved in tumorigenesis, tumor metastasis, viral replication, septic shock, fever, inflammation, and autoimmune diseases including Crohn's disease, and rheumatoid arthritis as well as graft-versus-host disease.