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The exomes, which make up 1% of the genome, of 264 trios (a child with epilepsy and both birth parents) were sequenced to seek a genetic cause for infantile spasms and another seizure disorder called Lennox-Gastaut syndrome. This study found over 300 gene changes that were not inherited from either parent, including a change in CHD2< /em> in one child. This child had myoclonic seizures beginning at age 6 months and was developmentally delayed. < /p>