It’s the ultimate protein race!
The whole idea is to identify the proteins present in a group of cells. You put them on the start line in a track of gel, fire the power of an electrical field, and they’re off!
Lighter proteins move faster and quickly take the lead. The heavier ones are quite tired of always getting beated up: “always the same, damn Southern”.
Southern was the fellow who invented this procedure, but what we saw today was a Western, not a Southern. And there’s the Nothern, too. But those are similar different stories…