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Chromosomes were counterstained with DAPI (blue). Female (a) and male (b) metaphase showing strong hybridization signals (red) on the centromeres of chromosomes 4 and 5. Polytene complement (c) showing strong hybridization signals (red) on the centromeric heterochromatic blocks (C) of chromosomes III and IV (arrows). Bar = 3 µm (a, b), 20 µm (c).
