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Summary Hyperammonaemia is common in neonates with branched-chain organic acidaemias, primarily due to the inhibition of N-acetylglutamate (NAG) synthetase; NAG is an activator for carbamylphosphate synthetase I, the first enzyme of the urea cycle. N-Carbamylglutamate, a NAG analogue, has been reported to correct hyperammonaemia in neonates with organic acidaemias. It is, however, uncertain how the...