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<italic>exosc8</italic> and <italic>exosc9</italic> homozygous mutant zebrafish have increased apoptosis.(A) Acridine orange staining performed on 48-hpf wild-type, exosc8 homozygous mutant and exosc9 homozygous mutant zebrafish embryos. Representative images of each category are shown here. Four different clutches of offspring with 24 embryos each have been analysed; the acridine orange staining has been performed and evaluated first (without knowledge of the genotype), followed by genotyping of all embryos that were stained. Scale bar: 500 μm. (B) Quantification of acridine orange positive spots. Spots were counted in 36 images of wild-type or heterozygous embryos and 18 images of homozygous mutant embryos. Bright spots in the yolk sac were not counted. Error bars represent the standard error (±SEM) and statistical analysis was performed using the unpaired t test. ****P < 0.0001.
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