Representative optical images of deformed zebrafish caused by exposure to ZnO NPs.

The control group shows the normal appearance at 24 hpf (A) and at 96 hpf (C). Yolk-sac edema (B) and pericardial edema (D) are shown after exposure to 1 mg/L ZnO NPs for 72 and 96 hpf, respectively.

Acknowledgments
This image is the copyrighted work of the attributed author or publisher, and ZFIN has permission only to display this image to its users. Additional permissions should be obtained from the applicable author or publisher of the image. Full text @ PLoS One