Carbamoylphosphate synthetase I (CPS1); Ornithine transcarbamylase deficiency (OTC); Argininosuccinate Synthase 1 (ASS1); Argininosuccinate lyase (ASL), Arginase-1 (ARG1); N-acetylglutamate synthase (NAGS); Ornithine transporter (SLC25A15); or citrin (SLC25A13). The gene discussed is ARG1; the disease is ornithine carbamoyltransferase deficiency.