FGF14 and Intellectual disability: Notably, in [3], in a Swedish family carrying a 600 kb deletion affecting the whole FGF14 gene as well as ITGBL1 gene, all carriers had intellectual disability (II:5 IQ 92, III:1 IQ 65, III:2 IQ 71, IV:1 IQ 72–82), suggesting complete penetrance of this phenotype with FGF14 allelic loss.