title: The nuclear pore complex: its free existence and an hypothesis as to its origin.
mesh_terms: D000818:Animals; D005075:Biological Evolution; D002467:Cell Nucleus / Q000378:metabolism / Q000648:ultrastructure*; D005260:Female; D008854:Microscopy, Electron; D010063:Ovum / Q000648:ultrastructure; D014176:Protein Biosynthesis; D012455:Salamandridae / Q000033:anatomy & histology; D014779:Virus Replication