So cholesterol is another important type of constituent that is found inside our cell membrane. And what cholesterol does, it basically controls the fluidity of our cell. So how fluid or how rigid our cell is? Now, in eukaryotes, our cholesterol basically controls the cell and membrane fluidity. In prokaryotes, it's another type of molecule that also looks like cholesterol, but it's called a hopinoid. Both of these types of molecules basically function in the same exact way.