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Many of these melatonin functions are mediated by a family of membrane receptors expressed in the oral epithelium and salivary glands. Using immunoblotting and immunohistochemistry, recent studies have shown that the melatonin membrane receptors, <jats:styled-content style=\"fixed-case\">MT<\/jats:styled-content>1 and <jats:styled-content style=\"fixed-case\">MT<\/jats:styled-content>2, are present in rat and human salivary glands. To date, no investigation has dealt with the ultrastructural distribution of the melatonin receptors. This was the aim of the present study, using the immunogold method applied to the human parotid gland. Reactivity to <jats:styled-content style=\"fixed-case\">MT<\/jats:styled-content>1 and, with less intensity, to <jats:styled-content style=\"fixed-case\">MT<\/jats:styled-content>2 appeared in the secretory granules of acinar cells and in the cytoplasmic vesicles of both acinar and ductal cells. Plasma membranes were also stained, albeit slightly. 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