We have the second beta sheets, then we continue, we have the second alpha helix, we continue, we have the third beta sheet and so forth and we continue all the way until we get to the end. Now what's so special about this colored loop? Well, this loop is known as the P loop. And the reason we call it the P loop is because this polypeptide section is the section that contains the amino acids that are responsible for actually binding to and interacting with the ATP molecule. And more specifically, it will interact with the negative charges on this triphosphate group of that ATP molecule. And if we study the sequence of nucleotides among the different types of NMP kinases on that p loop, this is what we're going to see.