So inside our body, we have at least seven types of carbonic and hydraase enzymes. But the one that is found inside the red blood cells is known as carbonic and hydrase two. Now, what we want to discuss in this lecture is the active side of this carbonic and hydrate two. And we want to discuss the mechanism that this molecule actually uses to promote and catalyze this reaction. And what this reaction ultimately does is it hydrates the carbon dioxide. So water adds onto the carbon dioxide, and that ultimately produces the carbonic acid, which dissociates into bicarbonate ion and the H plus ion.