So this band is the collection of these green proteins. This band is the collection of these intermediate proteins, and this band is a collection of these very tiny proteins. And although each and every individual protein will follow its own unique pathway through these channels and pores, because their rates will be exactly the same. So for any given protein that is of equal size, because their rate will be the same, they will end up at the same exact location along our gel. So we have the large proteins, intermediate and the small proteins. Now, the final question is, what is the difference between gel electrophoresis and gel filtration chromatography?