So this is our bifunctional Alastairic enzyme and we have two different domains. This domain is known as the phosphorptokinase two domain, PFK two, and this domain is known as the fructose bisphosphatase II domain. So FBPA two now, because this ends in a kinase, you might expect that its function is to basically attach a phosphoryl group onto some type of molecule. And that's exactly right as we'll see in just a moment. And likewise, because this molecule is known as a phosphatase, you might imagine that its function is to actually remove of a sporal group from a molecule. And that is exactly right.