Antagonist profile of <i>Apis mellifera</i> 5-HT₂ receptors.

IC50 values (potency) and relative efficacy were calculated from concentration-response curves for each drug. Efficacy is given as the maximal inhibition (%) of fluorescence compared with 50 nM serotonin in the absence of antagonist and calculated by curve fitting. Values are means of the results of two independent experiments, each performed in octuplicates.