Nitric oxide (NO) is a colorless gas and stable free radical that turns blue when it is liquefied or solidified. It was discovered and studied in 1772 by J. Priestley, who called it “nitrous air”. A ...

"Nitric oxide is a chemical messenger which cannot be stored and can rapidly diffuse across cell membranes to act at remote sites (in contrast to conventional neurotransmitters which cannot pass ...