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Fig. 4. Ectopic and allelic pairing of the lac operator array loci in EL702C plants. (A) Percentage of loci showing ectopic pairing (untreated hemizygous nuclei) or ectopic/allelic pairing (untreated and Dex-treated homozygous nuclei). (B) Scheme of chromosome 3 (EL702C) with the transgene insertion positions and the flanking regions used as markers for FISH. (C) Hemizygous nuclei showing ectopic pairing (top) or separation (bottom) of transgenic loci. (D) Homozygous nuclei with ectopic pairing of both transgenic loci (top, could be intrachromosomally or between homologues), allelic pairing of only the distal locus (middle) or separation of both loci (bottom). Bars, 3 µm.