Now, if you don't know what differential centrifugation is, we're going to focus on the details of that process in the next lecture. But what it basically does is it uses angular motion, it uses centripetal acceleration to basically separate the components inside the homogeneous based on their density. So the more dense a certain component is, the lower along our test tube it will end up and the less density is, the higher up along a test tube it will actually be. So in the first step after step one, we basically take our test tube with our homogeneous. We place it into the baranas and it basically rotates and eventually it separates that mixture. So the very dense material ends up at the bottom.