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Transcriptionally active 35S rDNA sites (nucleolar organizing region; NOR) in Allium spp. that were detected by silver staining: A. moly (a); A. sativum (b); A. oreophilum (c); A. nigrum (d); A. karataviense (e); A. porrum (f); A. sphaerocephalon (g). Bar 10 μm
