title: Direct demonstration of eight-fold symmetry in nuclear pores.
mesh_terms: D000818:Animals; D002458:Cell Fractionation; D002467:Cell Nucleus; D005260:Female; D008722:Methods; D008854:Microscopy, Electron; D010063:Ovum / Q000166:cytology*; D013194:Staining and Labeling; D014562:Caudata / Q000033:anatomy & histology*