title: Quantitative morphometric study of cell elements in the early stages of development of the human embryonic heart.
mesh_terms: D002454:Cell Differentiation; D002467:Cell Nucleus; D003593:Cytoplasm; D004721:Endoplasmic Reticulum; D006003:Glycogen; D006056:Golgi Apparatus; D006321:Heart / Q000196:embryology*; D006801:Humans; D008854:Microscopy, Electron; D008928:Mitochondria; D009206:Myocardium / Q000166:cytology*; D009210:Myofibrils
chemical_list: D006003:Glycogen