And this is what we call the hydrophobic effect. So in the same way that it's the hydrophobic effect that allows the protein structure to basically form into its three dimensional shape and it's the hydrophobic effect that allows the nucleic acids to basically aggregate and form the double helix of DNA. It's the hydrophobic effect that is the driving force of the formation of the MyCell structure as well as of the bimolecular sheet, the lipid bilayer. So let's move on to the lipid bilayer. So in this particular case, these lipids actually contain a very thin fatty acid, a very thin hydrocarbon portion. So in any one fatty acid we only have one of these tails.