So we have the polar heads, and so some of you basically ask why I don't actually draw as I go along in the lecture. And that's because it takes up lots and lots of time and that's time that you don't want to lose. So I basically create these diagrams and write my notes ahead of time to basically save your time so that the lecture is as effective and efficient as possible so that you can get the information out as quickly as possible and go on with your lives. Okay, so there are essentially five different steps in this process. And let's begin with this diagram right here. And notice so this is our membrane, the phospholipid bilayer, and this is our protein pump, our ABC transporter.