And these are known as the seven transmembrane helix receptors, or simply 70 M receptors. Now, the structure of these receptors basically consists of seven membrane spanning alpha helices, as shown in this particular diagram. So this is our phospholipid bilar membrane. We have 123-4567 of these membrane spanning alpha helices. And notice they span the membrane in a snake like fashion. And that's why sometimes we call these seven transmembrane helix receptors helix receptors.