So these are the two gels that we can basically use and the one that we use determines or which one we use is determined by the size of that initial DNA molecule. Now, so we take our fragments and we place them into the gel electrofreeze setup. And now the gel electrophoresis basically separates the DNA fragments based on size. So the largest fragments, fragment A, will be all the way at the top because it will experience the greatest resistance, while the smallest fragment, fragment e, will be found all the way at the bottom because it does not experience a large resistive force. And once we separate the five fragments based on size, we can then basically transfer that result onto a special polymer sheet that we can use more effectively. And usually we use the nitrocellulose polymer sheet.