Figure. Concentration-dependent activation of LTB4R2 by LTB4. Reporter cells were transfected with either the expression plasmid for leuko­triene B4 receptor 2 (LTB4R2) or the mock plasmid and treated with various concentrations of leuko­triene B4 (LTB4). 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 36 nM.