title: Organ-cultured chick embryonic hearts of various ages. II. Ultrastructure.
mesh_terms: D000818:Animals; D002642:Chick Embryo; D003896:Desmosomes / Q000648:ultrastructure; D004594:Electrophysiology; D004721:Endoplasmic Reticulum / Q000648:ultrastructure; D006321:Heart / Q000196:embryology* / Q000502:physiology; D006329:Heart Conduction System / Q000502:physiology*; D008854:Microscopy, Electron; D009206:Myocardium / Q000648:ultrastructure*; D009924:Organ Culture Techniques; D011188:Potassium / Q000502:physiology; D012508:Sarcolemma / Q000648:ultrastructure; D012519:Sarcoplasmic Reticulum / Q000648:ultrastructure; D012964:Sodium / Q000502:physiology; D013779:Tetrodotoxin / Q000494:pharmacology
chemical_list: D013779:Tetrodotoxin; D012964:Sodium; D011188:Potassium