MethiothepinReceptors, SerotoninSerotonin AntagonistsSumatriptanSerotonin Receptor AgonistsKetanserinSerotonin8-Hydroxy-2-(di-n-propylamino)tetralinErgotamineQuipazineReceptor, Serotonin, 5-HT1B5-MethoxytryptamineReceptors, Serotonin, 5-HT1MetergolineArteriovenous AnastomosisSpiperoneTetrahydronaphthalenesMethysergideSulfonamidesRadioligand AssayIndolesMuscle ContractionMuscle, Smooth, Vascular