Significance of 'empty vesicles' in postganglionic sympathetic nerve terminals.
D000818:Animals; D007498:Iris / Q000294:innervation*; D008854:Microscopy, Electron; D009411:Nerve Endings / Q000032:analysis / Q000166:cytology*; D009638:Norepinephrine / Q000032:analysis; D013564:Sympathetic Nervous System / Q000166:cytology*
D009638:Norepinephrine