title: Ultrastructural observations on the maturation and secretion of granules in atrial myocardium.
mesh_terms: D000818:Animals; D003594:Cytoplasmic Granules / Q000648:ultrastructure; D006056:Golgi Apparatus / Q000648:ultrastructure; D000882:Haplorhini; D006325:Heart Atria / Q000648:ultrastructure; D008253:Macaca mulatta; D009206:Myocardium / Q000378:metabolism / Q000648:ultrastructure*; D010215:Papio; D051381:Rats