So cholesterol interferes with the regular interactions of the fatty acids. However, because the cholesterol molecule, by being present inside that membrane, because it basically stimulates formation of complexes between the cholesterol molecules and these glycophosolipid molecules, like the one shown here, they basically are responsible for forming these very important structures we call lipid rafts. So what exactly is a lipid raft? Well, basically a lipid raft is a section of the membrane that contains a high concentration of cholesterol molecules as well as the glycophospholipids. And because we have a high concentration of these lipids within the area of the membrane, what that does is ultimately it increases the rigidity and makes that membrane less fluid. Because if in a given section, if we're in that lipid rack region, we have many more of these large molecules.