Indeed, Pescucci et al. (2003) reported a 10.4-Mb deletion of 2q24.3eq31.1 spanning a cluster of sodium channel genes including SCN3A, SCN2A, SCN1A, SCN9A, and SCN7A in a 4-year-old girl with seizures, postnatal growth retardation, microcephaly, facial dysmorphism, developmental delay, stereotypic and repetitive hand movements, and sleep disturbances. The gene discussed is SCN3A; the disease is Global developmental delay.