Mutations in the homeodomain of the human SIX3 gene cause holoprosencephaly - Wallis, Deeann E.; Roessler, Erich; Hehr, Ute; Nanni, Luisa; Wiltshire, Tim; Richieri-Costa, Antonio; Gillessen-Kaesbach, Gabriele; Zackai, Elaine H.; Rommens, Johanna; Muenke, Maximilian (Nature Genetics, 1999)