So let's suppose we have a single fatty acid and we take that fatty acid and place it into solution. Now let's suppose this fatty acid is ionized. So what does that mean? So we have an ionizable fatty acid which means we have this hydrocarbon backbone shown in red that is not polar, so it's hydrophobic. And we have this polar section which is basically the carboxylic acid. And the ionized version of this fatty acid means this carboxylic acid is the protein.