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Fluorescent in situ hybridisation of 18S rDNA (green signal) in a Cycas revoluta, b Fritillaria imperialis and c Gnetum gnemon. Karyotype ideograms of Cycas revoluta (d) showing chromosomes bearing 18S rDNA signals (dashed line boxed), rDNA locations indicated by arrowheads. Scale bar = 1 μm
