Model for demonstrating the differences in old and recent models for the liability to autism. The California autism study has found a higher concordance rate in fraternal twins and more of the liability must be attributed to shared environmental factors than previously expected. The heritability measures are not to scale.

Ingo Helbig

Child Neurology Fellow and epilepsy genetics researcher at the Children’s Hospital of Philadelphia (CHOP), USA and Department of Neuropediatrics, Kiel, Germany

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