NO is synthesized by
Nitric oxide is formed from Arginine by the enzyme Nitric oxide synthase.The enzyme utilizes NADPH and molecular oxygen. Citrulline is also formed.Ref: DM Vasudevan - Textbook of Biochemistry, 7th edition, page no: 227
Uracil
Aspaate
Guanosine
Arginine
Metabolism of protein and amino acid