title: Nitric oxide: a new paradigm for second messengers.
mesh_terms: D000818:Animals; D006801:Humans; D008670:Metals / Q000378:metabolism; D015394:Molecular Structure; D009569:Nitric Oxide / Q000494:pharmacology / Q000502:physiology*; D019001:Nitric Oxide Synthase / Q000037:antagonists & inhibitors / Q000378:metabolism; D015290:Second Messenger Systems / Q000502:physiology*
chemical_list: D008670:Metals; D009569:Nitric Oxide; D019001:Nitric Oxide Synthase