File:Amphibian oocyte transcription.jpg
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Amphibian oocyte transcription
Figure 144 from Chapter 4 (Nucleus) of 'The Cell' by Don W. Fawcett M.D. Amphibian oocyte nuclei contain numerous extra-chromosomal nuclei, each of which contains a tandem array of genes encoding ribosomal RNA.
Here, using the methods developed by O.L. Miller Jr. and colleagues, the extrachromosomal nuclei from a newt oocyte have been dispersed in low salt, and centrifuged through a sucrose cushion containing formaldehyde on to a carbon coated grid.
Active transcription is seen by the tree-like structures in which each branch represents a growing transcript.
Untranscribed spacer DNA is seen between each transcript.
(Micrograph courtesy of Oscar Miller).
NCBI Organism Classification: Notophthalmus viridescens
Cell Type: oocyte
Cellular Component: nucleolar chromatin
Original Image: CIL:11043 http://www.cellimagelibrary.org/images/11043 original image has been rotated 90 degrees.
Licensing: Attribution Non-Commercial; No Derivatives:This image is licensed under a Creative Commons Attribution, Non-Commercial, No Derivatives License.
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| current | 07:22, 26 April 2011 | | 1,200 × 841 (475 KB) | S8600021 (talk | contribs) | ==Amphibian oocyte transcription== Figure 144 from Chapter 4 (Nucleus) of 'The Cell' by Don W. Fawcett M.D. Amphibian oocyte nuclei contain numerous extra-chromosomal nuclei, each of which contains a tandem array of genes encoding ribosomal RNA. Here, |
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