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Tyrosine hydroxylase (TH) LI was present in trigeminal ganglia (TG), but not in dural afferents. (A) TH LI was present in a small subpopulation of TG neurons (right panel). None of the TG neurons with TH LI was retrogradely labelled from the dura (middle panel). (B) TH LI was undetectable in TG neurons retrogradely labelled from the dura.
