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Tetrahydrobiopterin, superoxide, and vascular dysfunction.
Vásquez-Vivar J. Vásquez-Vivar J. Free Radic Biol Med. 2009 Oct 15;47(8):1108-19. doi: 10.1016/j.freeradbiomed.2009.07.024. Epub 2009 Jul 21. Free Radic Biol Med. 2009. PMID: 19628033 Free PMC article. Review.