Calcium dose response data for the effects of conjugated and unconjugated SP at the rSPR expressed in CHO cells. Values are the peak Ca++ elevation produced by each drug expressed as the % of the ionomycin response for that coverslip. ANOVA showed significant dose-dependency, but no difference between Ca++ responses produced by the drugs was shown. Each data point represents the average of at least 5 experiments. Alexa 488-SP is not graphed since it did not elicit specific Ca++ responses at the rSPR.