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An autosomal dominant syndrome caused by mutations in the HRAS gene, encoding GTPase HRas, a signaling molecule involved in control of cell growth and division. The condition is characterized by coarse facial features, loose skin folds, developmental delays, hypotonia, multiple cardiac problems (structural heart anomalies, hypertrophic cardiomyopathy), short stature, hyperinsulinism, and an increased risk for development of neoplasia.
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