So we have the adenine children red, we have the thymine shown in dark purple, we have the orange, that's the guanine, we have the cytosine, that's the light purple. And so what we mean by palindromic sequences of DNA, if we read these bases going this way, we get the same exact reading if we go backwards. So going this way along the blue single strand we have aagct. And going this way in the opposite direction along the green strand, the other single strand we also get Aagct. So that's exactly what we mean by a palindromic sequence. And most of these restriction enzymes, restriction enzymes basically look for these types of Palindromic sequences on the DNA and that's where they cleave those DNA molecules.