But the ones that don't, the proteins that don't will essentially move straight down along our tube. And we'll discuss that in much more detail in the next hour of electros. Now, gel electrophoresis is something we spoke about already in biology. So gel electrophoresis is the process by which we separate. We use the charge on the protein to move that protein along an electric field, and we basically separate the proteins based on size. So notice that gel filtration chromatography and gel electrophoresis, these two methods both use the size factor.