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Brain Res. 1984 Jun 25;304(2):392-6.

Substance P in the rat parotid gland: evidence for a dual origin from the otic and trigeminal ganglia.


The substance P innervation of the rat parotid was investigated using retrograde tracing with the fluorescent dye True Blue, in combination with the immunohistochemical localization of substance P. Retrogradely-labelled cells were seen in the otic, trigeminal, superior cervical and nodose ganglia. A proportion of the True Blue-labelled cells in the otic and trigeminal ganglia also contained substance P-like immunoreactivity providing direct evidence for a dual origin of substance P in the rat parotid. In addition, these results imply that in the rat otic ganglion substance P and acetylcholine coexist.

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