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- Publisher
- Karger
- Copyright
- © 2004 S. Karger AG, Basel
- ISSN
- 1424-8581
- eISSN
- 1424-859X
- DOI
- 10.1159/000079296
- Publisher site
- See Article on Publisher Site
Abstract
B chromosomes are now known in eight Brazilian rodent species: Akodon montensis, Holochilus brasiliensis, Nectomys rattus, N. squamipes, Oligoryzomys flavescens, Oryzomys angouya, Proechimys sp. 2 and Trinomys iheringi. Typically these chromosomes are heterogeneous relative to size, morphology, banding patterns, presence/absence of NORs, and presence/absence of interstitial telomeric signals after FISH. In most cases, Bs are heterochromatic and late replicating. Active NORs were detected in two species: Akodon montensis and Oryzomys angouya. As a rule, Bs behave as uni or bivalents in meiosis, there is no pairing between Bs and autosomes or sex chromosomes and also their synaptonemal complexes are isopycnotic with those in A chromosomes.
Journal
Cytogenetic and Genome Research – Karger
Published: Aug 1, 2004