Sublethal endpoints of toxicity in zebrafish embryos exposed to 1 μM G4 dendrimers from 6–96 hpf and assessed at 96 hpf. In A and B, the horizontal white line is the measure of total body length, and black squares connected by dotted lines represent the measure of axial curvature (i.e., bent trunk with the trunk angle measured in degrees). Panel A is a representative control zebrafish larva and Panel B is a representative G4 dendrimer-exposed zebrafish larva. In C and D, the white dotted line outlines the area of the head and the black dotted line outlines the pericardial sac. In E and F, the black dotted line outlines the area of the caudal fin. Panels C and E are representative control zebrafish larva, and D and F are representative G4 dendrimer-exposed larva.