title: "Periodisch Structurierte Körper" (PSK) in the perivitelline space of rat and mouse embryos.
mesh_terms: D000818:Animals; D001755:Blastocyst / Q000648:ultrastructure; D005260:Female; D051379:Mice; D009940:Organoids / Q000648:ultrastructure; D051381:Rats; D015044:Zona Pellucida / Q000648:ultrastructure; D015053:Zygote / Q000648:ultrastructure*