On the other end, on the right side, we're going to have a high PH, a basic environment. Now, we're also going to connect both ends of that gel to a voltage source. We're going to create an electric potential difference between the two sides, and that will create an electric field. And we'll see why that's important. Just a moment. So once we set up this apparatus, what we do next is we take our mixture of proteins and we essentially place it into our gel.