So another type of suicide inhibitor that we commonly use is AZT. And AZT is a molecule that acts as a suicide inhibitor, and it basically treats HIV. So these are the three different types of Irreversible inhibitors. So we have group specific inhibitors, which are basically these Irreversible inhibitors that bind onto specific groups, specific residues, specific amino acids. We have substrate analogs, also known as affinity labels, that essentially resemble that substrate, and so they can fit into the active side of that substrate and modify that particular active side in some covalent way. And we also have suicide inhibitors that basically bind into the active side, and they begin the normal process as if they were the normal substrate molecule.