Microorganisms have developed several mechanisms to survive in their hosts' environments. These include competition with their hosts for metal acquisition and resistance to host defenses such as NO (Nitric Oxide), a cytotoxic weapon generated by macrophages. In eukaryotic cells, NO is metabolically produced by NOS (NO Synthase) from L-Arginine, O2 (Molecular Oxygen), and NADPH (Nicotinamide Adenine Dinucleotide, Reduced). In macrophages, an inducible NO synthase (iNOS or NOS2) is produced after activation by endotoxins or...
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