title: Cytodifferentiation: a causal antecedent of looping?
mesh_terms: D000557:Ambystoma; D000818:Animals; D002454:Cell Differentiation; D002642:Chick Embryo; D006321:Heart / Q000196:embryology*; D008855:Microscopy, Electron, Scanning; D008954:Models, Biological; D009210:Myofibrils / Q000502:physiology* / Q000648:ultrastructure; D051381:Rats