So these are both Atpas, and what that means is they're membrane pumps that break down ATP molecules directly directly and use the energy that is stored within the chemical bonds of the ATP molecules to move other molecules and ions against their electrochemical gradients. Now, not all membrane pumps actually utilize ATP molecules directly. And membrane pumps that don't break down ATP directly yet are able to actually move molecules and ions against their electrochemical gradients are known as secondary transporters. So another important category of membrane pumps are the secondary transporters. And as we'll see in just a moment, there are two types. So we see that secondary transporters are these transmembrane pumps that do not actually break down ATP molecules directly.