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5HT1DR LI was detected in fibres with tyrosine hydroxylase (TH) LI in the dura. (A) TH LI reveals dense sympathetic postganglionic innervation of the dura mater. TH LI appeared in close proximity to meningeal arteries (arrows) and in the parenchyma of the dura (arrows). (B) Example of fibres in which both 5HT1DR LI and TH LI were detected in the dura.
