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Background Dihydroergotamine (DHE) is an antimigraine drug that produces cranial vasoconstriction and inhibits trigeminal CGRP release; furthermore, it inhibits the vasodepressor sensory CGRPergic outflow, but the receptors involved remain unknown. Prejunctional activation of α2A/2C-adrenergic, serotonin 5-HT1B/1F, or dopamine D2-like receptors results in inhibition of this CGRPergic outflow. Since...
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