title: Sheeding of the zona pellucida by guinea pig blastocysts: an ultrastructural study.
mesh_terms: D000818:Animals; D002462:Cell Membrane / Q000502:physiology*; D010064:Embryo Implantation; D004622:Embryo, Mammalian / Q000166:cytology; D005260:Female; D005854:Germ Cells / Q000166:cytology* / Q000254:growth & development / Q000502:physiology; D006168:Guinea Pigs / Q000196:embryology*; D008854:Microscopy, Electron; D010873:Pinocytosis; D011247:Pregnancy