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URL: http://scholar.google.com/scholar_lookup?title=Specificity+of+a+third+kind%3A+reactive+oxygen+and+nitrogen+intermediates+in+cell+signaling&year=2003&author=Nathan&journal=J.+Clin.+Invest.&volume=111&pages=769-778.+doi%3A10.1172%2FJCI200318174&pmid=12639979