So let's move on to the lipid bilayer. So in this particular case, these lipids actually contain a very thin fatty acid, a very thin hydrocarbon portion. So in any one fatty acid we only have one of these tails. And so this is not a bulky molecule and because it's not bulky, these tails can easily and snugly fit on the interior space of that myosyl. But bulkier lipids so, which are larger and contain thicker hydrophobic tails will spontaneously rearrange themselves in an acoustic environment and form not in my cell but a lipid bilayer. And if we take a cross section of that lipid bilayer this is basically what it looks like.