Intrathecal delivery of CNTF using encapsulated genetically modified xenogeneic cells in amyotrophic lateral sclerosis patients. - Aebischer,P.; Schluep,M.; Deglon,N.; Joseph,J.M.; Hirt,L.; Heyd,B.; Goddard,M.; Hammang,J.P.; Zurn,A.D.; Kato,A.C.; Regli,F.; Baetge,E.E. (Nat Med, 1996)