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5HT1DR LI was detected in both peptidergic and non-peptidergic fibres in the dura mater. (A,B) Examples of fibres in which both 5HT1DR LI and calcitonin gene-related peptide (CGRP) LI were detected. There are also CGRP LI fibres that do not overlap with 5HT1DR LI (arrowhead). (C) Examples of fibres in the dura mater in which only 5HT1DR LI was detected.
