https://www.selleckchem.com/products/biocytin.html
Methemoglobin (metHb) arises from the oxidation of ferrous hemoglobin (HbFe2+, Hb) to ferric hemoglobin (HbFe3+, metHb), which is unable to bind gaseous ligands such as oxygen (O2) and carbon monoxide (CO), and binds to nitric oxide (NO) significantly slower compared to Hb. Therefore, metHb does not elicit vasoconstriction and systemic hypertension in vivo due to its extremely slow NO scavenging rate in comparison to cell-free Hb, but will induce oxidative tissue injury, demonstrating the potential of using metHb as a control material
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