Human IL-4 Ultrasensitive ELISA KitHuman IL-4 Ultrasensitive Immunoassay is a 3.5 - 4.5 hour solid phase ELISA designed to measure IL-4 in cell culture supernates, serum, and plasma. It contains recombinant IL-4 and antibodies raised against this protein. It has been shown to accurately quantity recombinant IL-4. Results obtained with naturally occurring IL-4 samples showed linear curves that were parallel to the standard curves obtained using the kit standards. These results indicate that the immunoassay kit can be used to determine relative mass values for natural IL-4.