“…is now well documented for a wide variety of excitable cells. These cells include the squid giant axon (Curtis & Cole, 1942;Hodgkin & Huxley, 1945), neurones in the leech nervous system (Schlue & Deitmer, 1984), the vertebrate node of Ranvier (Huxley & Stampfli, 1951 a, b), and mammalian dorsal root ganglion cells (Somjen, Dingledine, Connors & Allen, 1981).…”