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. Now the next question is how exactly does penicillin act on these peptidoglycan cell walls? Well before we answer that question, let's discuss the structure of peptiglycan and then let's discuss how the bacterial cells actually build this peptiglycan cell wall. So if we examine this specific strain of bacterial cells, this is the type of peptaglycan structure that we're going to see.