Shown is a fibroblast 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. Also shown is the distributi...

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

Like other ciliates two types of nuclei are present. A germinative micronucleus and a RNA-producing macronucleus. Both have nuclear envelopes with pores and both have ribosomes attached to their outer...

Transmission electron micrograph of a thin section of the nucleus of a normal HeLa cell - from a study of the role of the nuclear porin ALADIN. Other images in this group show details of nuclear pore...

High resolution of a daughter micronucleus in anaphase of a dividing cell of Didinium nasutum. The chromosomes are compacted into one large heterochromatic body. Remnants of the mitotic division spind...

Transmission electron micrographs showing the unusual nucleolar structures in Sertoli cells of ruminants, with varying numbers of vesicles and tubules; the upper panel illustrates such an organization...

Shown is an image of a thin section showing the ultrastructure of the nucleus and nuclaer envelope in fibroblast from a Hutchinson-Gilford Progeria syndrome patient which carries a mutation in the gen...

Ancistrum is a marine ciliate that inhabits the mantle cavity of mytiliid mussels. This image shows a good view of the macronucleus, mitochondria with tubular cristae, and what are probably flask-shap...

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...

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...