And each one of these molecules basically binds to inhibits a specific type of enzyme found inside our body. So let's begin with nerve gas. Nerve gas is a very dangerous, very potent Irreversible inhibitor and it forms covalent bonds. 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.