The Quantikine Human TGF-alpha Immunoassay is a 4.5 hour solid-phase ELISA designed to measure human TGF-alpha in cell culture supernates, serum, plasma, and human milk. It contains E. coli-expressed recombinant human TGF-alpha and has been shown to accurately quantitate the recombinant factor. Results obtained using natural human TGF-alpha 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 naturally occurring human TGF-alpha. Range: 15.60 - 1000 pg/mL. Sensitivity: 7.1 pg/mL. Time: 4.5 hours