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Fig. 2 Semiquantitative severity grading of the loss of pigmentation in the retinal pigment epithelium (indicated by arrows): To account for the different intensity levels of pigmentation loss, four grades were assigned: (A) no effect (control), (B) weak effect (low propylthiouracil [PTU] concentration), (C) clear effect (medium PTU concentration), (D) strong effect (high PTU concentration), after 5 days of exposure.
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Full text @ Environ. Toxicol. Chem.