Coexistence of serotonin and cholecystokinin in paraneurons of the foetal sheep lung.

The coexistence of serotonin and cholecystokinin was studied in foetal sheep lungs at pseudoglandular stage of development by light microscopic immunohistochemistry. The coexistence was examined by staining consecutive sections with the different antibodies. Serotonin and cholecystokinin immunoreactivity was found within consecutive sections of most bronchopulmonary neuroepithelial bodies and in consecutive sections of the same intrapulmonary autonomic ganglia.