Solute Carrier Family 9, Subfamily A (NHE1, Cation Proton Antiporter 1), Member 1 (SLC9A1) ELISA Kit: The test principle applied in this kit is Sandwich enzyme immunoassay. The microtiter plate provided in this kit has been pre-coated with an antibody specific to Sodium/Hydrogen Exchanger 1 (NHE1). Standards or samples are then added to the appropriate microtiter plate wells with a biotin-conjugated antibody specific to Sodium/Hydrogen Exchanger 1 (NHE1). Next, Avidin conjugated to Horseradish Peroxidase (HRP) is added to each microplate well and incubated. After TMB substrate solution is added, only those wells that contain Sodium/Hydrogen Exchanger 1 (NHE1), biotin-conjugated antibody and enzyme-conjugated Avidin will exhibit a change in color. The enzyme-substrate reaction is terminated by the addition of sulphuric acid solution and the color change is measured spectrophotometrically at a wavelength of 450nm