title: Heart development in the Mexican salamander, Ambystoma Mexicanum. II. Ultrastructure.
mesh_terms: D000557:Ambystoma / Q000033:anatomy & histology*; D000818:Animals; D002454:Cell Differentiation; D006321:Heart / Q000196:embryology* / Q000254:growth & development; D008854:Microscopy, Electron; D009206:Myocardium / Q000166:cytology