Figure. Concentration-dependent activation of PTGFR by fluprostenol. Reporter cells were transfected with the expression plasmid for prosta­gland­in F receptor (PTGFR) and treated with various concentrations of fluprostenol. 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 98 pM.