That's why we call this method enzyme linked immunosorbin acid. Enzyme link means we create this monoclonal antibody shown in green that can bind specifically to this blue antibody. And that green antibody also contains an enzyme that will become important in step d. So in step c, an enzyme linked antibody that can bind to that antibody of interest, the blue one, is added to our mixture, to our well. Now, if the antibody of interest, if that blue antibody is bound onto that red antigen, then our enzyme linked antibody will bind onto this antibody as shown in that diagram. Now, in the next step, we basically want to first remove all the different types of molecules inside that sample that are not bound to anything. And so once we wash our sample, we remove anything that is not bound.