[Immunohistochemical and electron microscopic identification of the cells producing serotonin and prostaglandin F2 in the rat thymus].

Using immunohistochemical and electron microscopic methods the presence of serotonin and prostaglandin F2 containing granules in some epithelial cells of rat thymus has been shown. The modulatory role of these hormones in the thymic immunocompetent cells production is discussed.