EGLN2 (Egl-9 Family Hypoxia-Inducible Factor 2): EGLN2 is an enzyme that regulates the stability of hypoxia-inducible factors (HIFs), which are key proteins involved in the cellular response to low oxygen levels. EGLN2 plays a critical role in helping cells adapt to hypoxia and is significant in cancer biology, as HIFs are often elevated in tumors.