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. So the major difference between this structure and this structure is that this structure actually consists of two different layers. So two phosphol lipid layers, one and two. And each one of these sides, each one of these layers is known as a leaflet.