L1 knockout mice show dilated ventricles, vermis hypoplasia and impaired exploration patterns. - Fransen E; D'Hooge R; Van Camp G; Verhoye M; Sijbers J; Reyniers E; Soriano P; Kamiguchi H; Willemsen R; Koekkoek SK; De Zeeuw CI; De Deyn PP; et al. (Human molecular genetics, 1998)