The dynamic nature of netrin-1 and the structural basis for glycosaminoglycan fragment-induced filament formation by Meier, M, Gupta, M, Akgül, S, McDougall, M, Imhof, T, Nikodemus, D, Reuten, R, Moya-Torres, A, To, V, Ferens, F, Heide, F, Padilla-Meier, GP, Kukura, P, Huang, W, Gerisch, B, Mörgelin, M, Poole, K, Antebi, A, Koch, M, Stetefeld, J