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Argininosuccinate lyase deficiency (ASLD) is caused by a defect of the urea cycle enzyme argininosuccinate lyase (ASL) encoded by the ASL gene. Patients often present early after birth with hyperammonemia but can also manifest outside the neonatal period mainly triggered by excessive protein catabolism. Clinical courses comprise asymptomatic individuals who only excrete the biochemical marker, argininosuccinic...
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