Rat NRK fibroblasts in phase contrast and stained for the nucleolar proteins nucleostemin (green) and fibrillarin (red). Panels at right show merge. Rows show different stages of mitosis, from top, ea...

High resolution image of the nucleoli of the macronucleus. Nucleoli have a core of DNA that contains the genes that are transcribed into ribosomal RNA. Assembly of the ribosomal subunits from this pro...

A time lapse experiment of Saccharomyces cerevisiae expressing GFP-tagged NET1. NET1 is a core subunit of the RENT complex that involves in nucleolar silencing and telophase exit; stimulates transc...

A time lapse experiment of Saccharomyces cerevisiae expressing GFP-tagged NET1. NET1 is a core subunit of the RENT complex that involves in nucleolar silencing and telophase exit; stimulates transc...

A time lapse experiment of Saccharomyces cerevisiae expressing GFP-tagged NET1. NET1 is a core subunit of the RENT complex that involves in nucleolar silencing and telophase exit; stimulates transc...

A time lapse experiment of Saccharomyces cerevisiae expressing GFP-tagged NET1. NET1 is a core subunit of the RENT complex that involves in nucleolar silencing and telophase exit; stimulates transc...

A time lapse experiment of Saccharomyces cerevisiae expressing GFP-tagged NET1. NET1 is a core subunit of the RENT complex that involves in nucleolar silencing and telophase exit; stimulates transc...

Transmission electron micrograph showing the nucleus of a mouse cardiac tissue with nucleolus. At the center of the image is a large structure called the nucleus which is a membrane-limited compartmen...

Transmission electron micrograph of the salivary gland of the tick Rhipicelphals appendiculatus illustrating the dramatic difference in nuclear size seen in different cell types. Here, the large (prob...

Transmission electron micrograph of nucleus showing the characteristic features of glutaraldehyde fixation introduced as a primary fixative in 1962 and since used routinely. Chromatin appears differen...