Now, it consists predominantly of beta pleated sheets that run in an antiparallel direction, as shown here. So one error goes here, the other error goes here. And it consists of alternating hydrophobic and hydrophilic amino acids. The hydrophobic amino acids interact with the non polar hydrocarbon tails of that membrane, while the polar, the hydrophilic amino acids actually point inward into that porn and that interacts with the aqueous solution and the polar molecules passing through that particular pouring channel. Now, in fact, we have many examples of these channels inside our bodies. So the example I mentioned earlier, the gap junctions that exist, for instance, in cardiac, in cardiac muscle cells, basically are these channels that allow the propagation, the movement of the ions, and that creates the movement of that action potential from one cardiac cell to the adjacent cardiac cell.