And inside this compartment, we don't have organelles, the cell nucleus or anything like that, but we can put in special molecules, as we'll see in just a moment, like drugs or DNA into this compartment. And that can be delivered to cells of our body. So liposomes are relatively small, so about 50 nm in diameter acquisition compartments that are surrounded by phospholipid bilayer membrane. So essentially the red portion is that non polar hydrophobic region of those phospholipid, the tails. And these blue sections are basically those polar heads. So we have one side, one leaflet, and the other side the second leaflet.