Factors of low molecular weight in the cerebrospinal fluid of guillain-barré and multiple sclerosis patients block membrane sodium channels : H. Brinkmeier, K.H. Wollinsky, M.J. Seewald, J.-P. Hülser, H.-H. Mehrkens, H.H. Kornhuber, R. Rüdel. Dept. of General Physiology, University of Ulm, D-7900 Ulm, Germany; Dept. of Anesthesiology, Rehabilitation Hospital, D-7900 Ulm, Germany; Dept. of Neurology, Rehabilitation Hospital, D-7900 Ulm, Germany