The core FOXG1 syndrome phenotype consists of postnatal microcephaly, severe mental retardation, absent language, dyskinesia, and corpus callosum hypogenesis - Kortüm, Fanny; Das, Soma; Flindt, Max; Morris-Rosendahl, Deborah J.; Stefanova, Irina; Goldstein, Amy; Horn, Denise; Klopocki, Eva; Kluger, Gerhard; Martin, Peter; Rauch, Anita; Roumer, Agathe; et al. (Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), 2011)