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Nitrogen dioxide radical

Nitrogen- and oxygen-containing radical formed from nitric oxide and molecular oxygen.

Also: •NO2, •ONO

Reactive nitrogen species that can react with biomolecules and propagate oxidative damage, including lipid peroxidation and protein nitration.

How one textbook covers it

Advanced Nutrition and Human Metabolism, 8th ed. (Gropper) — Glossary
Reactive nitrogen species that can react with biomolecules and propagate oxidative damage, including lipid peroxidation and protein nitration.

Free radical, Peroxynitrite