It is noteworthy that the synthesis of endogenous substrates such as steroid hormones, cholesterol, active vitamin D congeners, and bile acids involves many pathways catalyzed by enzymes associated with the metabolism of xenobiotics
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For example, in certain lung pathophysiological conditions, oxygenation of terminal airways becomes uneven, such that this temporal and spatial variance in oxygen abundance essentially determines the survival of the lung cells via oxygen-dependent activation of cell regulators and genes critical to defending their structural/functional characteristics [5, 8, 10, 13, 14, 1618, 2123, 26, 27]
Hepatology 60 , 715735 (2014)