Assay Diluent - Non-Mammalian (formerly Neptune Assay Diluent) is formulated to address nonspecific binding issues with human, porcine, or bovine serum or plasma samples tested in antigen-down ELISA formats. This non-mammalian assay additive works to enhance the specific anti-analyte/antigen antibody signal without denaturing the plate-adsorbed antigen molecules.