Substitutions of PrP N-terminal histidine residues modulate scrapie disease pathogenesis and incubation time in transgenic mice. oleh Sabina Eigenbrod, Petra Frick, Uwe Bertsch, Gerda Mitteregger-Kretzschmar, Janina Mielke, Marko Maringer, Niklas Piening, Alexander Hepp, Nathalie Daude, Otto Windl, Johannes Levin, Armin Giese, Vignesh Sakthivelu, Jörg Tatzelt, Hans Kretzschmar, David Westaway