title: Ultrastructure of Hertwig's epithelial root sheath during early root development in premolar teeth in dogs.
mesh_terms: D000818:Animals; D001641:Bicuspid / Q000166:cytology / Q000254:growth & development / Q000648:ultrastructure*; D003804:Dentin / Q000648:ultrastructure; D004285:Dogs; D004848:Epithelium / Q000648:ultrastructure; D008854:Microscopy, Electron; D014092:Tooth Root / Q000166:cytology / Q000254:growth & development / Q000648:ultrastructure*