(A–D) CPK representations 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%. Blue, DOPC; red, DPPC; green, cholesterol. To see this figure in color, go online.