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・ Hypovitaminosis D
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Hypoxia-inducible factors
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Hypoxia-inducible factors : ウィキペディア英語版
Hypoxia-inducible factors

Hypoxia-inducible factors (HIFs) are transcription factors that respond to changes in available oxygen in the cellular environment, to be specific, to ''decreases'' in oxygen, or hypoxia.
== Structure ==
Most, if not all, oxygen-breathing species express the highly-conserved transcriptional complex HIF-1, which is a heterodimer composed of an alpha and a beta subunit, the latter being a constitutively-expressed aryl hydrocarbon receptor nuclear translocator (ARNT). HIF-1 belongs to the PER-ARNT-SIM (PAS) subfamily of the basic helix-loop-helix (bHLH) family of transcription factors. The alpha and beta subunit are similar in structure and both contain the following domains:
* N-terminus – a bHLH domain for DNA binding
* central region – Per-ARNT-Sim (PAS) domain, which facilitates heterodimerization
* C-terminus – recruits transcriptional coregulatory proteins

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