NOS1 and central nervous system cancer: Additionally, phosphatidylcholine biosynthesis I, choline biosynthesis III, and glioma invasiveness signaling were only enriched in the PCN033 group, while neuronal NOS signaling and regulation of eIF4 and p70S6K signaling were only identified in the RS218 group, which exhibited distinct signaling pathways that might have strain specificity (Fig. 4b).