Nitric oxide (NO), a diffusible free radical gas, is involved in many biological functions, including cell signaling, stress mediation, cytotoxicity, and defense (Wink et al., 1996). Because of its reactive nature, NO can directly interact with cellular components including cysteine thiols, heme cofactors, iron-sulfur clusters, lipids, and DNA, as well as oxygen and other reactive oxygen and reactive nitrogen species (ROS/
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