And so we have the anti parallel arrangement of our two strands of polypeptide. Now, in this particular case, the only difference is there's still a parallel with respect to one mill, but now they run in the same direction. And what that will do is it will change the type of interaction that exists between our amino acids. In this case, we have a one to one interaction. So one amino acid interacts with opposing amino acid. But here we have one amino acid interacts with two different amino acids on the opposing strand.