And notice what we get after the two fold rotation, the 180 degree rotation about the Y and the X axis. We essentially produce a molecule that is exactly like this molecule here. And that's exactly what we mean by a palindromic sequence. So this is what we usually see when we're dealing with these restrictions. Restriction enzymes. When restriction enzyme enzymes actually cleave the double stranded DNA molecules, they cleave it in such a way so that they produce this two fold rotational symmetry.