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Fig. 1. DNA damage measured as cyclobutane pyrimidine dimers (means ± S.D.) of sea urchin (Strongylocentrotus droebachiensis) embryos exposed to UVR in the five treatment groups. Treatment groups that share superscripts within each developmental stage of the experiment are not significantly different from one another using multiple comparison testing (SNK) at a significance level of 0.05%.