Upper panel shows a transmission electron micrograph featuring the nuclear envelope with the nuclear lamina seen here as a uniform layer between the inner nuclear membrane and more darkly staining blo...

Shown are fibroblasts from a Hutchinson-Gilford Progeria syndrome patient which carries a mutation in the gene for lamin A (red), a major component of the nuclear lamina. The morphology of the envelop...

Shown is a fibroblast from a Hutchinson-Gilford Progeria syndrome patient which carries a mutation in the gene for lamin A (left image, red), a major component of the nuclear lamina. Also shown is th...

Transmission electron micrograph of a thin section of the nucleus of a HeLa cell expressing a mutant of the nuclear porin ALADIN. The nuclear envelope ultrastructure is not affected by the mutation. ...

A high resolution image of nuclear pores in face view included in an overview of the cytoplasm of Opercularia coarctata. TEM taken on 6/13/69 by R. Allen with Philips 300 operating at 60kV. Neg. 14,80...

An image of the micronucleus and macronucleus of Opercularia coarctata. The nuclear envelope has numerous pores, at least as many per unit length as in the macronucleus. Some areas of the outer membra...

High resolution image of the macronucleus of Coleps hirtus. Heterochromatin and nucleoli are seen as smaller and larger stained bodies, respectively, in the macronucleus. Many nuclear pores exist in t...

Grazing thin section through the nuclear envelope of a macronucleus. Nuclear pores are packed so tightly that they often form a hexagonal array with 6 pores surrounding a central pore. The pores often...

Nucleoli in a macronucleus of a cell undergoing micronuclear division. The nucleolus appears to have an organized surface layer composed of parallel threads of subunits. These may be developing riboso...

High resolution transmission electron micrograph of Halteria showing both the large macronucleus with nuclear pores, dense heterochromatin bodies and nucleolus, and the small micronucleus.