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Fig. 1. A cold-treated meristematic metaphase cell of rye showing the
co-localization of the rDNA sites detected by in situ hybridization (in red)
and the silver stained Ag-NORs (dark brown). On the condensed NORs (arrows),
the silver signal reveals the previous expression of rRNA genes, whereas the
two hybridization sites of identical size demonstrate that the two rDNA loci
have equivalent numbers of ribosomal cistrons. Bar, 5 µm.
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