Where oxygen is scarce.
D000860:Hypoxia / Q000378:metabolism*; D051795:Hypoxia-Inducible Factor 1, alpha Subunit; D010100:Oxygen / Q000378:metabolism*; D015534:Trans-Activators / Q000378:metabolism; D014157:Transcription Factors / Q000378:metabolism
D051795:Hypoxia-Inducible Factor 1, alpha Subunit; D015534:Trans-Activators; D014157:Transcription Factors; D010100:Oxygen