(a–d) Projection of a thickness profile in the xy plane of a phospholipid bilayer containing a 1:2 molar ratio of DOPC/DPPC, averaged after 150 ns of atomistic MD simulations with the following contents of cholesterol: (a) 0%, (b) 20%, (c) 30%, and (d) 40%. The thickness profile was evaluated by considering the average phosphorus-to-phosphorus distance. To see this figure in color, go online.