And although we'll find these phosphotide inside our cell membrane, we'll only find them in very, very small quantities. Now most of the time this phosphate group is actually modified with some type of alcohol. Usually the alcohol is either a choline, acerine or enochetol. And we have other common groups, but these are very common groups. So we have the choline, which contains this alcohol component. We have a serine, which is also an amino acid that contains this alcohol.