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ARNT/HIF-1 beta

HIF-2 alpha: HIF1A's Homologue with Similar and Divergent Functions

HIF-2 alpha is a member of the heterodimeric hypoxia-inducible factors/HIFs family (HIF-1, HIF-2, and HIF-3) which contains a common beta subunit but differ in their alpha subunits.

HIF-3 alpha: a versatile target with hypoxia dependent and independent functions

HIF-1 beta - activating gene transcription in response to hypoxia

Hypoxia-inducible factor 1 (HIF-1) is a heterodimeric transcription factor consisting of alpha and beta subunits. The levels of functional HIF-1 in the cell depends on the level of oxygen allowing cells to respond to hypoxic conditions. HIF-1α is a ubiquitously expressed protein containing an oxygen-dependent degradation domain that under normal conditions regulates its constant degradation. HIF-1 beta, on the other hand, is a stable constitutively expressed protein that localizes to the nucleus.