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.

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...

High resolution image of the macronucleus which contains microtubules that lie inside a seemingly intact nuclear envelope. Microtubules orient along the axis of macronuclear elongation in the form of ...

Tem1 (green) constitutively targeted to spindle pole bodies in nud1-2 cells at the restrictive temperature still displayed problems positioning the spindle (this image shows a misaligned spindle, CIL ...

Tem1 (green) constitutively targeted to spindle pole bodies in nud1-2 cells at the restrictive temperature still displayed problems positioning the spindle (this image shows a rebudded cell, CIL #1387...

The image shows a slice through a 3D tomographic reconstruction of a mouse adenocarcinoma cell based on x-ray microscopy. Live cells were cryofixed by plunge freezing in liquid ethane and the vitrifi...