It binds onto a special enzyme found inside the nervous system known as acetylcholine esterase. So remember, acetylcholine esterase is an enzyme that breaks down the neurotransmitter acetylcholine that is used to basically communicate between nerve cells. And so by binding onto that enzyme, onto the acetylcholine estherase, it inhibits that enzyme from breaking down that neurotransmitter. And that essentially leads to the breakdown of the nervous system and that leads to death of that particular individual. Now, what about penicillin? So nerve gas kills off that individual, but penicillin actually saves that individual because, for example, if an individual has an infection by some type of bacterial agent, if we add penicillin into that individual, what penicillin does is it binds until special enzyme found in that bacterial cell that essentially is used by the bacterial cell to form the bacterial cell wall.