So once again, in order to function effectively, biological systems must be able to regulate and control the activity and the functionality of enzymes. Special agents we call inhibitors can bind onto enzymes and inhibit or block their activity. So there are two categories of inhibitors. We have Irreversible inhibitors and we have Reversible inhibitors. So let's begin by briefly focusing on Irreversible inhibitors. So in Irreversible inhibition, that particular inhibitor basically binds onto the enzyme very tightly, very strongly.