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10.1371/journal.pbio.0030223 69 MartinG

UmbrelloMDysonAPintoBFernandezBSimonVFeelischMet alShort-term hypoxic vasodilation in vivo is mediated by bioactive nitric oxide metabolites, rather than free nitric oxide derived from haemoglobin-mediated nitrite reduction

Verdu EF, Armstrong D, Murray JA

Gradually increasing within standard ranges may help
