Okay, for a battery, the "cathode" is the (+) terminal and the "anode" is the (-) terminal, right? How come for gel electrophoresis, the (+) terminal is actually the "anode" (anions move toward the anode), and the (-) terminal is actually the "cathode"? I mean, I get why anions would move toward the positive terminal. What I don't get is the nomenclature. Shouldn't the positive terminal be called the cathode, the same way it is for electric circuits? Somebody please explain this to me. Is this just a fact about electrophoresis we should just memorize, or what?