title: Absence of adrenergic nerves in the human placenta.
mesh_terms: D002395:Catecholamines / Q000032:analysis; D005260:Female; D006651:Histocytochemistry; D006801:Humans; D008856:Microscopy, Fluorescence; D009647:Normetanephrine / Q000378:metabolism; D010920:Placenta / Q000294:innervation*; D011247:Pregnancy; D013564:Sympathetic Nervous System / Q000033:anatomy & histology*
chemical_list: D002395:Catecholamines; D009647:Normetanephrine