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rDNA mapping in the mitotic chromosomes of Allium × cornutum and the putative parental taxa (5S rDNA red, 35S rDNA green). (a, b)Allium cepa; (c, d)A. pskemense;(e, f)A. roylei; (g–i)A. × cornutum; Arrows in g, h and i indicate the smallest, barely visible 35S signal on the medium-sized metacentric chromosome originating from A. cepa. Scale bar = 10 μm.
