The Hypoxia-inducible Factor 1 (HIF1) protein is a heterodimeric transcription factor which plays an important role in mammalian oxygen homeostasis in conditions of hypoxia, or low oxygen concentration. HIF-1 alpha antibody reagents are widely used in disease research, as hypoxia is known to contribute to many diseases including cancer, pulmonary hypertension and congenital heart disease. We at Novus Biologicals are one of the leading antibody suppliers of HIF-1 products.