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Gases, such as nitric oxide (NO), carbon monoxide (CO), hydrogen sulfide (H2S), and sulfur dioxide (SO2) are known toxic pollutants in the air. However, they are now recognized as important signaling molecules synthesized in animals and humans from arginine, glycine (heme), and cysteine, respectively. At physiological levels, NO, CO, and SO2 activate guanylyl cyclase to generate cGMP which elicits...
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