title: Circadian and ultradian changes in synaptic vesicle numbers in nerve endings on adrenomedullary noradrenaline cells, and their modifications by pinealectomy and sham operations.
mesh_terms: D000313:Adrenal Medulla / Q000294:innervation / Q000502:physiology*; D000818:Animals; D002940:Circadian Rhythm; D008297:Male; D009474:Neurons / Q000502:physiology*; D009638:Norepinephrine / Q000502:physiology*; D010507:Periodicity; D010870:Pineal Gland / Q000502:physiology*; D051381:Rats; D013572:Synaptic Vesicles / Q000502:physiology* / Q000648:ultrastructure
chemical_list: D009638:Norepinephrine