Potassium channels differ in structure from the other channels in that they contain four separate polypeptide subunits, while the other channels contain four homologous domain but on a single polypeptide unit.
As canles de potasio difiren en estrutura das outras canles porque conteñen catro subunidades polipeptídicas separadas, mentres que outras canles conteñen catro dominios homólogos dun só polipéptido.