Instead, they can simply travel through the space around the beads. And because of that, in gel filtration chromatography, it's the larger protein that makes its way down to the column first, because it doesn't experience a large drag force like the small molecules that do travel to the beads do. And so that is the major difference between these two techniques. In gel electrophoresis, all the molecules have to move through the pores gel, and so they all feel the drag force. But in gel filtration chromatography, it's only the small molecules that can fit into those gel beads, and so they feel a drag force, but the larger proteins move through the space around the beads, and so it's they don't feel a force, a drag force like the small molecules do. And that's exactly why these concepts are basically reversed.