Components: ELISA 1X Assay/Sample Diluent Buffer A (Item D1); ELISA 5X Assay/Sample Diluent Buffer B (Item E1); HRP-Streptavidin (Item G); Rat IL-1 β Antibody-coated ELISA Plate (Item A); Biotinylated Rat IL-1 β Detection Antibody (Item F); Lyophilized Rat IL-1 β Protein Standard (Item C); ELISA Stop Solution (Item I); ELISA Colorimetric TMB Reagent (HRP Substrate, Item H); 20X Wash Buffer (Item B)