<unk>  (also called prostaglandin I2 or<unk>  is a prostaglandin member of the eicosanoid family of lipid molecules. It inhibits platelet activation and is also an effective vasodilator. When used as a drug, it is also known as epoprostenol. The terms are sometimes used interchangeably.
Prostacyclin
Endothelin
Angiotensin II 
Prostaglandin
Vasopressin 
Vasopressin
Endrin
Endothelium-derived relaxing factor