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VRL-1 immunoreactivity in the rat cranial autonomic ganglia

Immunohistochemistry for VRL-1, a newly cloned capsaicin-receptor homologue, was performed on the rat cranial autonomic ganglia. The immunoreactivity (ir) was detected in the majority of neurones in the pterygopalatine (66%) and submandibular ganglia (68%). In the tongue and carotid body, parasympathetic neurones contained VRL-1 ir. In the superior cervical ganglion, only 2% of postganglionic sympathetic neurones showed the immunoreactivity. VRL-1-ir nerve endings could not be detected in their peripheral tissues. These findings may suggest that VRL-1 has functions within neuronal cell bodies of the cranial autonomic ganglia.