Tumor necrosis factor alpha (TNF-alpha) is produced by neutrophils, activated lymphocytes, macrophages, NK cells, LAK cells, astrocytes endothelial cells, smooth muscle cells and some transformed cells. Mouse TNF-alpha occurs as a membrane-anchored form. The naturally-occurring form of TNF-alpha is glycosylated, but non-glycosylated recombinant TNF-alpha has comparable biological activity. The biologically active native form of TNF-alpha is reportedly a trimer. Human and mouse TNF-alpha show approximately 79% homology at the amino acid level and crossreactivity between the two species. Synonym: Tumor Necrosis Factor-alpha ( TNF-alpha), Mouse. Formulation: Lyophilized from a 0.2μm filtered solution in PBS, pH 7.2.