Used in research to study the renin-angiotensin system, particularly in cardiovascular and renal physiology. Commonly applied in cell culture and in vivo experiments to induce vasoconstriction, increase blood pressure, and stimulate aldosterone secretion. Also utilized in studies related to hypertension, heart failure, and kidney function. Frequently employed to activate angiotensin receptors (AT1 and AT2) to investigate signaling pathways and drug effects.