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Nuclear pores (a–e) appear differently according to sectioning planes. (a) A side-view of nuclear pore shows electron-dense diaphragm-like structure connecting fused inner (arrowheads) and outer (arrows) nuclear membrane. (b–d) Oblique sectioning through nuclear pores shows thickened nuclear membrane. (e) Face-on view of nuclear pore shows circular electron-dense structure. N, nucleus. Scale bar: 100 nm.
