“Antagonists, including alpha-bungarotoxin and choline, that are more specific for alpha7 nicotinic … capable of inhibiting the D-amphetamine sulfate-induced [Ca(2+)](c) rise, while D-amphetamine sulfate was found to be capable of inhibiting the [Ca(2+)](… induced by the alpha7-nicotinic receptor agonists, epibatidine and choline.”