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The Largest Known Chromosome Number for a Mammal, in a South American Desert Rodent

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The Largest Known Chromosome Number for a Mammal, in a South American Desert Rodent

L C Contreras et al. Experientia.

Abstract

Tympanoctomys barrerae, a desert specialist member of the family Octodontidae, until now thought to be conservative, and ancestral to South American hystricognath rodents, presents the highest diploid chromosome number (2n = 102) known in a mammal. Unexpectedly, its karyotype was found to be composed mainly of metacentric to sub-metacentric chromosomes. Mechanisms by which such a karyotype may have been derived are discussed.

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