Rubidium uptake and accumulation in peripheral myelinated internodal axons and Schwann cells Lehning, E.J.; Gaughan, C.L.; Eichberg, J.; Lopachin, R.M. Journal of Neurochemistry 69(3): 968-977 1997 0022-3042 10.1046/j.1471-4159.1997.69030968.x https://eurekamag.com/research/009/373/009373559.php