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...

High resolution view of the nuclear envelope of both the macronucleus, seen here, and the micronucleus consists of 2 membranes containing numerous perforations called pores. Proteins are imported thro...

The nuclear envelope of both the macronucleus, seen here, and the micronucleus consists of 2 membranes containing numerous perforations called pores. Proteins are imported through these pores and ribo...

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...

A freeze-fractured view of the nuclear envelope. The fracture in the middle of the figure exposes the cytosolic facing membrane. This can be distinguished by a fractured cytoplasmic organelle at the t...

Fluorescence images showing the distribution of GFP-ALADIN, a WD-repeat protein that is mutated in the human triple A syndrome (green), and the nucleoporin Nup358(red)within the nuclear envelope of He...

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

Nuclear pores in face view of Opercularia coarctata. TEM taken on 6/13/69 by R. Allen with Philips 300 operating at 60kV. Neg. 14,800X. Bar = 0.25µm. A print of the negative was scanned and processed...

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...

Nuclear envelope and spindle dynamics when the nucleus moves into the neck of kar9delta mutant cells arrested in S phase. Movie plays at 100x real time and is movie S6 in Proc Natl Acad Sci. 2009. 10...