5-methyl-tetrahydrofolate increases eNOS activity by preventing peroxynitrite-induced oxidation of tetrahydrobiopterin in human vessels - Antoniades, C; Shirodaria, C; Warrick, N; Cai, S; Leeson, P; Ratnatunga, C; Pillai, R; De Bono, J; Neubauer, S; Channon, K (2006)