Figure. Concentration-dependent activation of AGTR1 by angitensin II. Reporter cells were transfected with either the expression plasmid for angio­tensin II receptor type 1 (AGTR1) or the mock plasmid and treated with various concentrations of angitensin II. Data points shown are the mean ± SEM of an experiment performed in triplicate, and the curve is a fit to Hill equation with an EC50 of 920 pM.