We place them into a special type of porous gel and then we allow those fragments to move through the porous of the gel as a result of an electric field that exists within that gel. So we take the apparatus, we connect the apparatus to a voltage source and that creates an electric potential difference, a voltage difference between the two sides of that electrophoresis setup. And so what happens is, because we connected to our battery source, one end of that plate will have a negative charge. So that will be the count node and the other end will have a positive charge that will be the anode. Now remember, DNA contains a negative charge as a result of all those phosphate groups. And so all these DNA fragments that came from the gene will contain negative charge and they will move from the calcio, the negatively charged side, to the anode, the positively charged side.