Well, to see what we mean by that, let's compare the following two diagrams. So, once again, we're basically taking the following diagrams. So we're only considering two amino acids. So we have amino acid number one, amino acid number two that are connected by this peptide bond, which we're going to draw in the following manner to basically designate the fact that this is more of a double bond than it is a single bond. And what that means is now we have cyst, trans isomerism. So in this particular case, as the case is in all of these peptide bonds, we have a transconfiguration.