KE00165 is a solid phase sandwich Enzyme Linked-Immuno-Sorbent Assay (Sandwich ELISA). The CXCL9 ELISA kit is to be used to detect and quantify protein levels of endogenous CXCL9. The assay recognizes human CXCL9. An antibody specific for CXCL9 has been pre-coated onto the microwells. The CXCL9 protein in samples is captured by the coated antibody after incubation. Following extensive washing, another antibody of biotinylated specific for CXCL9 is added to detect the captured CXCL9 protein. For signal development, Sterptravidin-HRP is added, followed by Tetramethyl-benzidine (TMB) reagent. Solution containing sulfuric acid is used to stop color development and the color intensity which is proportional to the quantity of bound protein is measurable at 450 nm with the correction wavelength set at 630 nm.