Fig. 4

Pyrimidine metabolites are elevated in urea cycle disorders (UCDs).The levels of elevated pyrimidine metabolites in subjects with UCDs are shown. The red dashed line indicates the z-score of 2. ARG1D arginase deficiency, ASLD argininosuccinate lyase deficiency, ASS1D citrullinemia, OTCD  ornithine transcarbamylase deficiency.