The nuclear envelope in freeze-etching.
D000818:Animals; D002467:Cell Nucleus; D002645:Chickens; D004912:Erythrocytes / Q000166:cytology; D005260:Female; D005613:Freeze Etching; D005615:Freezing; D006652:Histological Techniques; D008099:Liver / Q000166:cytology; D008854:Microscopy, Electron; D010063:Ovum / Q000166:cytology; D014981:Xenopus