Ready-to-use ELISA kits are available for the detection of HIF2, an alias of the protein, endothelial PAS domain protein 1. The official gene symbol is EPAS1. The protein, with a mass of 96.5 kDa and length of 870 residues, is reported to be nuclear. It may be known by other names, including: PAS domain-containing protein 2, HIF2-alpha, HIF-1alpha-like factor, HIF-1-alpha-like factor, EPAS-1, and endothelial PAS domain-containing protein 1, and class E basic helix-loop-helix protein 73.