So what that means is water is going to flow from the inside to the outside. And so on the inside the cell, we're going to have a low osmotic pressure. Now, when the scientists took those cells and placed them into a medium that we would typically find inside our body, what they found was water basically rushed into the cell that enlarged the cell, and the cell eventually lysed. Now, they knew that if the cell contained peptidoglycan cell wall, it would not lice. And so what that means is that penicillin molecules somehow acted on that peptigly and cell wall. So again, this experiment basically led to the conclusion that penicillin prevents the formation of the peptidoglycan cell wall because it's the peptidoglycan cell wall that gives the cell stability structure and give the ability to actually withstand or resist a high estimate pressure that can exist once the cells are placed into the environment that is found inside our body.