title: Electronmicroscopical study of the fusion of the atrioventricular endocardial cushions in the embryonic chick heart.
mesh_terms: D000818:Animals; D002462:Cell Membrane; D002642:Chick Embryo; D004699:Endocardium / Q000166:cytology / Q000196:embryology*; D006346:Heart Septum / Q000196:embryology; D008854:Microscopy, Electron