<prompt> In all the following metabolic disorders, clinical features are seen due to accumulation of toxic compounds EXCEPT?PhenylketonuriaMaple syrup urine diseaseUrea cycle defectsMitochondrial disorders  <response>: Clinical features are seen due to accumulation of toxic compounds in: Phenylketonuria, Maple syrup urine disease, Urea cycle defects, organic acidurias porphyrias. Mitochondrial disorders involve defects of energy production or utilisation in various organs of body. 