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<p><b>Hypoxia-inducible factors</b> (<b>HIFs</b>) are <a href="page.php?w=transcription_factors">transcription factors</a> that respond to decreases in available <a href="page.php?w=oxygen">oxygen</a> in the cellular environment, or <a href="page.php?w=Hypoxia_%28medical%29">hypoxia</a>. They also respond to instances of <a href="page.php?w=pseudohypoxia">pseudohypoxia</a>, such as thiamine deficiency. Both hypoxia and pseudohypoxia leads to impairment of <a href="page.php?w=adenosine_triphosphate">adenosine triphosphate</a> (ATP) production by</p><p>
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