Now, let's suppose we asked these two kids to walk down a road, and in the middle of the road, we have a table. On that table, we have chocolate chip cookies. Now, as the two kids walk along the pathway, the kid that loves those chocolate chip cookies will stop at the table to actually eat those cookies, while the kid that doesn't like them will keep on walking. And so, basically, the kid that makes it to the end of the pathway is the kid that is not attracted to those chocolate chip cookies. And so, in the same analogous way, because this negatively charged protein isn't attracted to the negatively charged beads, it will make it down to that pathway the fastest. It will be collected at the bottom the fastest as compared to the other proteins.