Thin section showing nucleolus of a Human neuroblastoma SK-N-SH cell imaged with a FEI Tecnai 20 energy filtered electron microscope at 200 KV and a 20 eV energy window. Overlay of net phosphorus dist...

Transmission electron micrograph illustrating the 'classic' appearance of the nucleus in osmium tetroxide fixed material. In this pancreatic acinar cell nucleus, the only prominent feature is the lar...

Transmission electron micrograph of a cross section through the nucleolus from a Chinese hamster spermatogonium revealing a complex distribution of regions of varying granular textures.

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 glutaraldehyde fixed pancreatic acinar cell showing the characteristic features of nuclear chromatin with this preparative method. Darkly staining heterochromatin (...

Thin section showing nucleolus of a Human neuroblastoma SK-N-SH cell imaged with a FEI Tecnai 20 energy filtered electron microscope at 200 KV and a 20 eV energy window. Overlay of net phosphorus dist...

Transmission electron micrographs of Opossum spermatogonia showing different regions within the nucleolus. One region is more lightly staining and fine textured, the other denser and more coarsely tex...

Transmission electron micrograph showing the highly compact nucleolus in the salamander hepatocyte. A finer textured central region is surrounded by a coarser region.

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...

Transmission electron micrograph of section through the macronucleus of Nassula sp containing many darkly staining nucleoli.