And once we wash, we then add that specific substrate, that specific molecule that is converted by this enzyme that is linked to our green antibody. And once we add our substrate, that enzyme will begin to transform that substrate to some type of product. And when that transformation takes place, that causes a color change in our sample. And that tells us that the antibody is present inside that sample. Because if the antibody was not present in our sample, then following that washing process, we basically would remove any antibody that was not bound. And if that blue antibody was not bound to a red antigen, then we essentially remove everything that was present in our mixture, including these green antibodies that contain the enzyme.