Ultrastructural colocalization of the bioactive mediators 5-hydroxytryptamine and bombesin in endocrine cells of human fetal airways

Endocrine cells in the airway epithelium of human fetal lungs are known to contain an amine, 5-hydroxytryptamine (5HT), and a peptide, bombesin (BOM). These mediators may be involved in regulating smooth muscle and secretory activity in the airways as well as in development of the fetal lung. Howeve...

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