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The genome of Mycobacterium tuberculosis (Mtb) encodes 20 different cytochrome P450 enzymes (P450s). P450s are mono-oxygenases, which are historically considered to facilitate prokaryotic usage of unusual carbon sources. However, their preponderance in Mtb strongly indicates crucial physiological functions, as does the fact that polycyclic azoles (known P450 inhibitors) have potent anti-mycobacterial...