The Quantikine? Human Fas Ligand/TNFSF6 Immunoassay is a 4.5 hour solid-phase ELISA designed to measure human Fas Ligand in cell culture supernates, cell lysates, serum, and plasma. It contains CHO cell-expressed recombinant human Fas Ligand and has been shown to accurately quantitate the recombinant factor. Results obtained using natural human Fas Ligand showed linear curves that were parallel to the standard curves obtained using the Quantikine? kit standards. These results indicate that this kit can be used to determine relative mass values for natural human Fas Ligand. Range: 15.60 - 1000 pg/mL. Sensitivity: 5.1 pg/mL. Time: 4.5 hours