Illustration showing lysozyme acting on a bacterial cell wall. The cell wall (grey bricks) is shown with the bacterial membrane (yellow and brown) below it. The molecular structure of the bacterial cell wall is shown above the cell wall, consisting of glycosaminoglycans. Lysosome is an enzyme that causes the hydrolysis (breaking of bonds due to water) of the bonds between the N-acetylglucosamine (NAG) and N-acetylmuramic acid (NAM) molecules within the peptidoglycan chain of the cell wall. This causes destruction of the bacterial wall. Lysozyme is found in bodily secretions such as saliva, sweat, tears and mucus.