Figure 1: Nitric oxide pathway. Pathway relationships of studied metabolites. The primary focus of this study is included in the red rectangle. (ADMA: Asymmetrical Dimethylarginine; DDAH: Dimethylarginine Dimethylaminohydrolase; NOS: Nitric Oxide Synthase; PRMT: Protein Arginine Residues Methyl-Transferases; SDMA: Symmetrical Dimethylarginine).