So it moves protons from the inside to the outside of that cell. And by creating this proton gradient, what it does is it synthesizes, it is able to synthesize high energy ATP molecules. Now, if we examine the structure of this transmembrane protein, we'll see it consists of membrane spanning alpha helices. In fact, we have 123-4567 of these membrane spanning alpha helices. In fact, the predominant structure of transmembrane proteins inside our body actually consists of these membranespanic helices. Now, the thing about these membranespanic, alpha helices, is they consist predominantly of hydrophobic nonpolar amino acids.