“…However, in other "later" experiments excitability remained and presumably the resting potential was not greatly reduced under the same conditions. Subsequently, many other investigators have reported large reductions (> 20 mV) in the intracellularly recorded resting poten-tials of amphibian muscle fibers kept in calcium-free Ringer solution (ABOOD et al, 1963;EDMAN and GRIEVE, 1962, 1963a, 1963b, 1964JENDEN and REGER, 1963;KOKETSU and NODA, 1962;LUTTGAU, 1963) or calcium-free choline-Ringer solution (CURTIS, 1963).…”