concentration of angiotensin II at which the force of blood vessel contraction is half the maximum value (EC50) 2013-06-20T14:22:08Z A calculated value for the concentration of angiotensin II (AngII), the octapeptide, Asp-Arg-Val-Tyr-Ile-His-Pro-Phe, that is derived from angiotensinogen and acts as a powerful vasopressor and stimulator of aldosterone secretion, at which the energy produced by the active reduction in the diameter of a blood vessel in response to the application of AngII is halfway between the baseline value and the highest achievable value of such AngII-induced contractile energy. Ang2 half maximal effective concentration AngII half maximal effective concentration CHEBI:48432 CMO:0001657 JSmith angiotensin 2 half maximal effective concentration angiotensin II half maximal effective concentration (EC50) clinical_measurement_ontology angiotensin II response/sensitivity measurement concentration of vasoconstrictor at which the force of blood vessel contraction is half the maximum value (EC50)