Cytogenetic and Genome Research
Original Article
The Ag-NOR proteins present a crescent-shaped distribution at the secondary constrictions of metaphase PtK1 chromosomesSuja J.A.a · Hernandez-Verdun D.baDepartamento de Biología, Universidad Autónoma de Madrid, Madrid (Spain), and bInstitut Jacques Monod, Paris (France)
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Article / Publication Details
Accepted: July 09, 1996
Published online: May 20, 2008
Issue release date: 1996
Number of Print Pages: 4
Number of Figures: 0
Number of Tables: 0
ISSN: 1424-8581 (Print)
eISSN: 1424-859X (Online)
For additional information: https://www.karger.com/CGR
Abstract
The ultrastructural distribution of the proteins responsible for the silver staining of NORs was analyzed on serial thin sections of preembedded silver-stained rat kangaroo PtKi metaphase chromosomes. Our results show that the Ag-NOR proteins present a crescent-shaped distribution at the secondary constriction of each chromatid. Moreover, in somecases the crescent-shaped structures of both chromatids are not symmetrically arranged but show different orientations. These observations, together with our own and previously reported light microscopy results obtained on silver-stained mammalian chromosomes, lead us to suggest a mechanism for the formation of apparent secondary constrictions at NORs.
© 1997 S. Karger AG, Basel
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Article / Publication Details
Accepted: July 09, 1996
Published online: May 20, 2008
Issue release date: 1996
Number of Print Pages: 4
Number of Figures: 0
Number of Tables: 0
ISSN: 1424-8581 (Print)
eISSN: 1424-859X (Online)
For additional information: https://www.karger.com/CGR
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