[Immunohistochemical demonstration of the localization of melatonin and N-acetylserotonin in enterochromaffin cells].

Employing the immunohistochemical method with the use of specific antisera to melatonin and to N-acetylserotonine the authors showed the presence of these substances in the enterochromaffine cells of the gastrointestinal. It is emphasized that in the organism there exists a group of melatonin-producing cells whose principal link is served by the enterochromatoffine cells playing an important role in the maintenance of homeostasis due to their function--that of melatonin production.