Now, this is the loop and that's because when these two interact we have this section here that is not complementary to itself. And so it will form this loop structure in which we don't have any hydrogen bonds formed between these bases. And that means this will destabilize this localized region of the structure. And that can play an important role in further determining what that RNA molecule actually folds into. And we'll discuss that in much more detail in future lectures. So this is what we call a stem loop diagram.