text: The effects of D-1997 in the basilar artery were not modified by incubation with either the 5-HT2 receptor antagonist ketanserin (0.01-1 microM), the << 5-HT3 >> and 5-HT4 receptor antagonist ICS205930 ([[ tropisetron ]]; 0.1-10 microM), the 5-HT1A receptor antagonist spiroxatrine (0.01-1 microM), the beta-adrenoceptor blocker with high affinity for 5-HT1A and 5-HT1B binding sites (+/-)-pindolol (0.01-1 microM), or the alpha 1-adrenoceptor antagonist prazosin (0.01-1 microM).