So basically, we can develop different types of drugs that actually break the cross links between our polysaccharide chains within the Peptidoglycan and that kills off our bacterial cell. Other different types of drugs that we can use can also break our bonds between the disaccharides, between this red and this blue. And that can also kill off our cell membrane, our cell, because once we break that cell wall, it can no longer resist that hydrostatic pressure that our internal environment of the cell actually contains. And if we break our cell wall, that bacterial cell will actually burst. Now, let's look at our description of the grampositive and our gram negative cell envelope. So, the cell envelope of grampositive basically contains the inner membrane, the phospholipid membrane, and a relatively thick peptidoglycan cell wall.