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Fig. S2 Overexpression of top2b in blm embryos. Offspring of blm carriers were microinjected at 1-2 cell stages with zebrafish genomic top2b sequence (BAC clone CHORB736O22185Q) at 25 ng/μl (7.5 pg per embryo) or zebrafish top2b mRNA at 250 ng/μl (75 pg per embryo) and analysed at 33 hpf. A) Table of observed phenotypes upon injecting offspring of carriers of blm mutation with zebrafish top2b BAC clone or in vitro synthesised top2b RNA. B) Images of 33 hpf malformed larvae overexpressing top2b by ~4 fold following injecting with top2b mRNA. C) Ectopic expression of top2b mRNA does not rescue the small eye phenotype of blm embryos. Error bars represent the standard error of the mean.