Protein gene product 9.5 (PGP 9.5), a neuron-specific cytoplasmic protein, has recently been confirmed to be present extensively in endocrine paraneurons. The present immunohistochemical study examines its localization in sensory paraneurons in the rat. The immunoreactivity for PGP 9.5 was found in olfactory receptor cells, taste bud cells and vestibular hair cells, but not in the hair cells of Corti's organ or rod and cone cells in the retina. This finding indicates the availability of PGP 9.5 as a marker substance for certain sensory cells, and adds it to a list of 'neuron-specific' proteins which are shared by paraneurons.
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Iwanaga et al. (1992) studied this question.