Comprises of extracellular domain of Fas receptor fused to Fc portion of human IgG1 Produced in Baculovirus Expression Vector System (BEVS) Prified by affinity chromatography olecular weight of 50 kDa Fas belongs to TNF (tumor necrosis factor)/NGF (nerve growth factor) receptor family Expressed in various tissues and cells FasL belongs to TNF cytokine family FasL exists as membrane-bound or soluble form and and is expressed by activated T and NK cells Avoid multiple freeze-thaw cycles to prevent protein degradation