Transmission electron micrograph of a negatively stained preparation of ribosomes isolated from a 3-day old chick embryo that was maintained in a cold room for 24 hrs. The ribosome crystals seen in ...

High voltage (1MeV) transmission electron microscopy image of an isolated metaphase chromatid pair from a mouse A9 fibroblast, showing the fiber-like structure.

Purified rabbit skeletal muscle myosin in 0.6M KCl was adsorbed onto mica flakes, quick frozen by contact with a liquid helium-cooled copper block in a Heuser-type cryopress (Heuser JE, J. Mol.Biol. 1...

Purified rabbit skeletal muscle myosin in 0.6M KCl was adsorbed onto mica flakes, quick frozen by contact with a liquid helium-cooled copper block in a Heuser-type cryopress (Heuser JE, J. Mol.Biol. 1...

X-ray analysis shows that the nucleated erythrocytes of the amphibian Necturus maculosus (Mud Puppy) contains more ordered chromatin than most nuclei. Here, chromatin fibers were isolated from N. mac...

X-ray analysis shows that the nucleated erythrocytes of the amphibian Necturus maculosus (Mud Puppy) contains more ordered chromatin than most nuclei. Here, chromatin fibers were isolated from N. mac...

X-ray analysis shows that the nucleated erythrocytes of the amphibian Necturus maculosus (Mud Puppy) contains more ordered chromatin than most nuclei. Here, chromatin fibers were isolated from N. mac...

X-ray analysis shows that the nucleated erythrocytes of the amphibian Necturus maculosus (Mud Puppy) contains more ordered chromatin than most nuclei. Here, chromatin fibers were isolated from N. mac...

TEM image showing the basic nucleosomal organization of eukaryotic chromatin. Beaded chains of nucleosomes separated by linker DNA are seen emanating from a central mass of less dispersed chromatin.

Amphibian oocytes have many copies of rRNA genes that are actively transcribed. Newt ocyte nuclei were dissected, allowed to swell in a low ionic strength high pH buffer, centrifuged through a sucros...