The distribution of substance P (SP) in the olfactory bulb of the tench Tinca tinca was studied by using an indirect immunoperoxidase technique. Many perikarya and processes of the ganglion cells of the nervus terminalis (NT) were strongly labeled. In addition, SP-like immunopositive fibers were observed in the proximity of these neurons and extending along the olfactory nerves and the olfactory tracts. The ganglion cells of the NT were not immunoreactive for methionine- and leucine-enkephalin, motilin, vasoactive intestinal polypeptide, neuropeptide Y, cholecystokinin-8, and tyrosine hydroxylase.
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