NO synthase

Nitric oxide synthase (NOS) is an enzyme that produces nitric oxide (NO), a small signaling molecule. NOS converts an amino acid called L-arginine into nitric oxide and another molecule called citrulline. Nitric oxide plays important roles in the body, such as helping blood vessels relax and widen, aiding in immune responses, and transmitting signals between nerve cells. There are different types of NOS found in various tissues, including the brain, blood vessels, and immune system. Proper function of NOS is essential for maintaining healthy circulation, immune defense, and cellular communication.