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Fluorescence in situ hybridization of meiotic chromosome spreads using repetitive DNA probes in diploid and tetraploid Arabidopsis arenosa. Representative meiotic metaphase I stages in diploid (A,B) and tetraploid (C,D) using the centromere and telomere probes (A,C) and the 5S and 45S rDNA probes (B,D). Chromosomes have been stained with DAPI (blue). Bar = 10 μm.
