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20. Nitric oxide signaling: would you believe that a simple free radical could be a second messenger, autacoid, paracrine substance, neurotransmitter, and hormone? Murad F Recent Prog Horm Res; 1998; 53():43-59; discussion 59-60. PubMed ID: 9769702 [TBL] [Abstract][Full Text] [Related] [Next] [New Search]