MONDO_0004739 (urea cycle disorder) is a genetic inborn error of metabolism characterized by the deficiency of one of the enzymes necessary for the urea cycle. It results in accumulation of ammonia in the body. Also known as: disorder of metabolism of ornithine, citrulline, argininosuccinic acid, arginine and ammonia, disorder of urea cycle metabolism, inborn disorder of urea cycle metabolism and ammonia detoxification, inborn urea cycle disorder, urea cycle defect, urea cycle disorders, urea cycle metabolism disorder.