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Hyperekplexia (HPX) or startle disease is a rare hereditary neurological disorder characterized by generalized stiffness, excessive startle reflex to unexpected stimuli and a short period of generalized stiffness following the startle response, and can be complicated by umbilical or inguinal hernia, developmental delay and apnea spell. HPX is caused mainly by mutations in the GLRA1 gene, and has a...
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