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Angelman syndrome

what is Angelman syndrome source(wikipedia)

Angelman syndrome (; abbreviated AS) is a neuro-genetic disorder characterized by intellectual and developmental disability, sleep disturbance, seizures, jerky movements (especially hand-flapping), frequent laughter or smiling, and usually a happy demeanor.
AS is a classic example of genomic imprinting in that it is usually caused by deletion or inactivation of genes on the maternally inherited chromosome 15 while the paternal copy, which may be of normal sequence, is imprinted and therefore silenced.

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