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 enegy window. Left panel shows 'phosphorus' i...

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...

Mouse 3T3 fibroblast stained for the nucleolar protein nucleostemin (left, green) and signal recognition particle RNA SRP-RNA (right, red).

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...

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...

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...

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...

The 11 micrographs of the group are views of a serially-sectioned contracted Vorticella convallaria cell that show the main features of this cell. This figure shows 1 food vacuole; a segment of the ma...

Early transmission electron micrographs showing pore details in negatively stained preparations of nuclear envelopes. Upper panel shows the pronounced 8-fold symmetry in the closely spaced pores of t...

An 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 processed RNA an...