Figure. Concentration-dependent activation of PTAFR by CH3-cabamyl PAF C-16. Reporter cells were transfected with the expression plasmid for platelet acti­vat­ing factor receptor (PTAFR) and treated with various concentrations of CH3-cabamyl PAF C-16. 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 840 pM.