EPAS1（endothelial PAS domain protein 1） encodes a transcription factor involved in the induction of genes regulated by oxygen, which is induced as oxygen levels fall. The encoded protein contains a basic-helix-loop-helix domain protein dimerization domain as well as a domain found in proteins in signal transduction pathways which respond to oxygen levels. Mutations in EPAS1 are associated with erythrocytosis familial type 4.蛋白别名为：endothelial PAS domain protein 1;基因ID为：2034；蛋白质ID:Q99814
