Jerky movements of arms and legs, uncontrollable laughing, enlarged tongue, and speech difficulties; onset in early childhood. Cause is chromosomal microdeletion 15q11-13. Marked by mental retardation, blond hair, seizures and hypotonia.
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Jerky movements of arms and legs, uncontrollable laughing, enlarged tongue, and speech difficulties; onset in early childhood. Cause is chromosomal microdeletion 15q11-13. Marked by mental retardation, blond hair, seizures and hypotonia.