So the entire point in a western blot is to form a specific antibody that can bind onto that protein that we want to locate. And when this this process of binding takes place, it somehow allows us to visualize where that protein is, as we'll see in just a moment. So let's begin by supposing. We have a sample of proteins. Now, where did the sample actually come from? So suppose we have a collection of cells, and inside the cells we have proteins.