Now we saw two individual bands and noticed that these two bands are separated. What that means is one band describes a lighter DNA molecule and the other one describes a heavier DNA molecule. Also notice that this second band is along the same, I guess, y direction, y axis as this band here. And that means these two bands here have the same exact heaviness have the same exact density while this band, the second band, is found farther to the left along the x axis and so it is slightly lighter. Now, what exactly does that actually describe? Well, once again, it confirms the semiconservative replication process.