[{"from": "human", "value": "Could you give me a brief overview of this molecule? [NH0][=O]"}, {"from": "gpt", "value": "The molecule is an unstable free-radical gas which reacts rapidly with oxygen to form nitrogen oxides.  Water soluble, NO is produced normally in numerous tissues and is considered to be a mediator of cell-to cell communication; it functions in numerous processes including vasodilation, inflammation, and neurotransmission. (NCI04)"}]