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. 2007 Nov 22;116(2):223–230. doi: 10.1289/ehp.10742

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Incidence of gut malformations. (A) Ventral views of normal counter-clockwise intestinal coiling of an NF stage 46 untreated control tadpole (top), and mild (middle) and severe (bottom) gut coiling malformations observed in sibling tadpoles exposed to 35 mg/L atrazine (DMSO) from NF stages 42 to 46. Arrows reflect direction of coiling; bars = 0.5 mm. (B) Incidence of gut coiling malformations observed in tadpoles exposed to 10, 25, or 35 mg/L atrazine or vehicle (DMSO) from NF stage 41, 42, or 43 through NF stage 46. Sample sizes are same as in Figure 1.

*p < 0.05, and ^#p < 0.0001 as determined by post hoc pair-wise contrasts from logistic regression.