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"However, this might not remain true in malignancies in which the VHL gene (34)—or other genes that suppress HIF-1α (10)—are also mutated and thus display constitutively high levels of HIF-1α, which may overrun the fine-tuning BAP1 deubiquitylating activity.In addition to VHL, which is active in normoxia, other proteins mediate the ubiquitylation of HIF-1α in hypoxia."