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