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. 2014 Jan 13;14:24. doi: 10.1186/1471-2229-14-24

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Copyright © 2014 Fredotović et al.; licensee BioMed Central Ltd.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Distribution and origin of rDNA loci in triploid A. × cornutum. (a) Chromosomes carrying 5S and 35S rDNA in A. × cornutum and three putative parental taxa; (b) idiogram of A. × cornutum (modified from Puizina et. al. 1999); (c) origin and localisation of the 5S and 35S rRNA genes in triploid onion. Tri-colour circles, squares and pentagons were used to label the chromosomes that carry 5S and 35S rDNA in the progenitor species and the corresponding chromosomes in the triploid hybrid A. × cornutum.