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Synapsis of rye chromosomes in nuclei at pachytene in wheat-rye additions. (A,B) Nuclei showing partial synapsis of chromosomes 4R (A) and 6R (B). The ends of the short (S) and long (L) arms, the rye centromeres (c) and all telomeres (green) are shown. (C) Level of synapsis in the distal half of both arms of the seven rye chromosomes. Bars represent 10 μm.
