The human IL-21 ELISA development kit is ideal for users who want the flexibility of setting up their own ELISA assay. This product enables quantification of human IL-21 in solution, e.g. in cell culture supernatant. The kit contains a matched pair of monoclonal capture and detection antibodies, Streptavidin-ALP and ELISA standard. Plates and substrate are not included. Cross-react with IL-21 from non-human primates. Range: 7-700 pg/ml