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5-HT1D (but not 5-HT1B )-receptor immunoreactivity (i.r.) can be detected on trigeminal fibres within the spinal trigeminal tract of the human brainstem. The present study used immunohistochemical and morphometric techniques to determine the proportions of trigeminal fibres expressing substance P, CGRP or 5-HT1D -receptor immunoreactivities. Co-localization studies between 5-HT1D -receptor and sub
