So Eliza stands for enzyme linked Immunosorbin Assay. And this is a method that utilizes these monoclonal or sometimes polyclonal antibodies to determine and quantify the presence of some type of protein in our sample. Now, we're going to discuss two types of Eliza methods. In this lecture. We're going to examine indirect and sandwich Eliza. And although these two methods are slightly different, they use the same exact concept, they use the same exact principle.