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The mRNA expression DDR-related genes in 8 dpf sterlet embryos measured by qPCR. Embryos were exposed to BaP and etoposide continuously from fertilization to 8 dpf, and to CPT at 24–48 and 48–72 hpf. Results are represented as mean of at least four individual embryos. Error bars represent standard error of the mean. Letters indicate significant differences in gene expression between different treatments (Kruskal–Wallis test, p < 0.1).
