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A. Fraction of chromosomes in metaphase neuroblast nuclei with breaks. B. Fraction of metaphase neuroblast nuclei with polyploidy in different genotypes. * p<0.05, ** p<0.01, *** p<0.0001 (Fisher's exact test). Number of nuclei scored (left to right): 46, 27, 44, 54, 24, 54, 38, 18, 33, 26, 59, 53, 43.
