In our discussion on irreversible inhibitors, we briefly mentioned penicillin. And we said that penicillin is an example of a suicide inhibitor. It's basically a molecule that binds until an enzyme found bacterial cells and inhibits the activity of that enzyme. It prevents the enzyme from actually forming the peptidoglycan cell wall found around the membranes of bacterial cells. Now recall from biology that peptaglycan cell walls basically give that bacterial cell the ability to resist a high osmotic pressure. And it's because of that peptaglycan cell wall that once the bacterial cells enter our body that they don't actually immediately lice.