title: Atrial ultrastructure of the human embryonic and foetal heart.
mesh_terms: D002196:Capillaries / Q000196:embryology; D002454:Cell Differentiation; D003331:Coronary Vessels / Q000196:embryology; D005318:Fetal Heart / Q000648:ultrastructure*; D005865:Gestational Age; D006325:Heart Atria / Q000648:ultrastructure*; D006801:Humans