Used in biomedical research to detect and quantify endothelin-1 levels in monkey samples, particularly in studies related to cardiovascular function, endothelial health, and vascular diseases. Commonly applied in preclinical research to assess endothelial activation, monitor responses to therapeutic agents, and investigate mechanisms of hypertension, atherosclerosis, and kidney disease in non-human primate models. Provides a reliable, sensitive, and specific measurement of ET-1 in serum, plasma, or cell culture supernatants, supporting research in pharmacology and physiology.