Fig. 7. Dose-response curves for increase of cytosolic calcium ([Ca2+]i) during capsaicin administration. ( A ) Frequency of at least 50% increase of fluorescence ratio (R340/380) at each capsaicin concentration. ( B ) Magnitude of peak increase in R340/380at each capsaicin concentration. Line is fit by sigmoid dose-response curve (Prism 4.0; GraphPad Software Inc.).