So each of these photographs basically describes the band that correlates to the DNA molecules that were extracted. So if we take out our DNA molecule from our equalized cell that has not yet divided, then what we'll see is a single band that describes a single type of DNA molecule. Now, by the way, as we go this way from left to right along the x axis, we increase in density. And so if this is our test tube, this way it's towards the bottom of that test tube and this way it's towards the top of that test tube. And so if the band appears lower that means the DNA molecule that is described by that band has a higher density because the farther we go to the right along the x axis, the more dense our molecule is. And so initially what our initial sample showed was we had a single band.